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If you've spent more than a few tracks worth of time playing with Pandora, you know that you can't access every song or even every artist you may be into. You can find plenty of music by the Pixies, for example, but another favorite from my college days, Liz Phair, is nowhere to be found on the service.

Raditaz launched earlier this month with promises 14 million licensed tracks, compared to the "more than 900,000" currently offered by Pandora. But guess what?

Still no Liz Phair. And now, seemingly, no Pixies either.

Spotify was essential to Facebook's frictionless sharing plan. But not every app is down for cluttering news feeds with moment-to-moment information about what its users are doing, saying, thinking and listening to.

Music streaming service Pandora, for one, is staying out of Facebook's social apps completely. "It's true that music is a social experience, but it's also a very private experience," Pandora founder Tim Westergren recently told CNN. "We have to be very cautious."

Normally when a tech company launches a product or feature that's billed as a potential "killer" of a popular incumbent, there's cause to be skeptical. Quite often, that's just unsubstantiated hype either on the part of the company itself or tech writers.

In the case of Spotify's new Web radio feature, we're not going to go so far as to say that it's a "Pandora killer," but its inclusion in Spotify's desktop client is going to give the up-and-coming streaming service a tangible advantage over the 11-year-old Web radio service.

I'll never forget when I first discovered Napster. I was in high school and had heard about it from a friend. As an avid music fan, I was delighted to suddenly find myself with access to a seemingly limitless trove of songs, some of which were previously available only on $40 CD-R bootlegs in the back of record shops where they also sold paraphernalia strictly designed for smoking tobacco and only tobacco.

I never abandoned purchasing music all together, but the MP3 struck me as a far more convenient format than the compact disc, and Napster gave me quick and easy access to a world of MP3's. When Radiohead's "Kid A" showed up on Napster weeks before the CD was available in stores, what was I supposed to do? Ignore it?

Pandora, the customized Internet radio streaming service, has pushed out a redesigned interface to all users. The new UI comes with an added bonus: the company has removed its infamous 40 hour listening cap, enabling users to streaming an unlimited amount of music for free.

The Web interface for the popular music service has been totally overhauled, offering a sleeker, cleaner design with simplified controls. The top of the page contains iTunes-esque controls for playing, pausing and skipping songs, as well as voting them up or down. From the same toolbar, users can type in the name of any artist, composer or song to automatically generate a radio station based on their musical preferences.

Clear Channel, the largest radio station owner in the United States, has teamed up with music intelligence platform The Echo Nest to build an Internet radio service similar to Pandora and Last.fm.

Clear Channel's iHeartRadio service uses The Echo Nest's massive dataset of 30 million songs and 5 billion related data points to let users create radio stations based on their musical tastes. It has been dubbed a potential "Pandora killer" by Billboard and indeed its functionality could hardly be more similar to Pandora's. Users can create stations based on a particular artist or song, vote tracks up or down and skip a limited number of songs per station.

Internet radio service Pandora posted its first financial results as a public company yesterday, six months after filing for an IPO. While the company may not yet be profitable, it's off to a pretty good start in terms of growth. Its total revenue grew 117% year-over-year and its total listeners grew 125%.

Contained amongst these investor-pleasing stats was another takeaway: The company is now commanding ad rates comparable to those sold on terrestrial radio stations, as GigaOm pointed out.

Slacker Radio is looking for ways to add revenue to their mobile streams and is teaming with mobile video advertising company YuMe to optimize monetization of its mobile division. Slacker has between 25 and 30 million subscribers, most of whom come to the service from pre-loaded devices on most of the major U.S. carriers. As such, adding a stout mobile advertising model could mark Slacker as the next major force in the competitive music streaming market.

Slacker is in growth mode. With those 30 million members come almost 400,000 paid premium subscriptions. The company is able to convert about 10% of new mobile free subscribers to paid members, a robust number. Yet, it is important for Slacker to optimize its streaming product as 75% to 85% of listening on the service comes from the free streaming product and not the paid on-demand option. That is where YuMe comes in. With Spotify on the rise and Pandora the dominant service in the sector, Slacker has to make as many moves as it can to gain an edge.

In the battle of cloud music services, you have a variety of options including radio service like Pandora and Last.fm, online lockers like Google Music and Amazon Cloud Drive, Internet radio stations and premium, "program-your-own" services like MOG, Rdio, Rhapsody and Zune. But what if you want it all? Then you may want to consider mSpot and its recently updated mobile app for Android.

Pandora has been one of our favorite online destinations for streaming music recommendations for years now, but today, the site has gone one step further - stand up comedy.

The site, which lets you create stations according to genre or artist, has taken this same time-tested formula and applied it to the realm of stand-up comedy, bringing the likes of Rodney Dangerfield, Mitch Hedberg and George Carlin to its millions of monthly users.