To integrate Facebook into Gmail, Xoopit's new plugin uses a Facebook Connect button that logs you into your Facebook account. Once activated, you can set your Facebook status at any time by clicking the "F" icon at the upper right corner of your Gmail where there's now a Facebook status update box that displays your profile picture and your current status.

However, the best part of this plugin is that when you email with people who are also on Facebook, those messages will now also include their Facebook profile photos and status messages.These appear in Gmail's right-hand sidebar. Underneath each person's name is a link to "Recent Mail" and "More Info."Clicking on "Recent Mail" takes you out of the message you're in to a Gmail search for that person's email address (or addresses). The "More Info" button, though, just expands the box in the sidebar to display the latest attachments sent to you by that person.

These interactions aren't just fun - they're useful. Finding past messages or attachments sent is a common email task, so having these quick links available is a great feature.

As before, Xoopit's plugin also still installs a toolbar which is added to the top of your Gmail inbox and a sidebar widget. With either tool, you can find photos, videos, or files in your inbox. The sidebar widget also has a link that launches various games, perfect for when you can't read any more email but you just can't leave the inbox, either.

Although in the past we've shared our concerns over any plugin that needs your Gmail credentials to operate, the functionality provided by Xoopit may sway you to put your security fears aside and give it a try.

Note: Xoopit is a Firefox plugin.

Xobni, a company obviously catering to business users, have, as of today, launched a new version of their Outlook plugin. Needless to say, the Xobni team really knows their audience because this new version is offering built-in support for LinkedIn, the social network designed for business use.

With the new LinkedIn integration, Xobni now automatically shows a contact's current employer, job title, link to their LinkedIn profile, and contact photo in the app's sidebar. This is especially helpful for those who receive a lot of email from new contacts or have a hard time putting a face to name. Along with the LinkedIn support, Xobni still offers their core features - fast people and attachment search, threaded conversations, and automatic contact profiles.

Download Xobni

Xoopit

Depending on how comfortable you are handling over your email login information, you may find Xoopit either a major security risk or one of the more useful web applications you've seen in a long time. Marshall has argued that Xoopit is proof that Gmail needs a better API, but I decided to throw caution to the wind and use Xoopit anyway because...well...finding attachments is hard.

The service, which came out of private beta just last week, offers a Gmail plugin that lets you search your inbox for photos, videos, and files - all of which are accessible with one click from the new toolbar added to the top of your Gmail inbox. You can also use the addon to find photos, videos, or files sent you by a specific person, and, as you type their name in the box provided, Xoopit helpfully auto-completes the entry.

On the Xoopit homepage, things get a little more interesting. Here, the latest items from your email display in a familiar lifestream-like view that practically has you looking for the "like" button. To the side of the screen, the people who send you the most items are listed and linked to - and those results may surprise you, bringing new insight into what's really going on in your inbox. (Forwarders of chain emails be warned - you've been identified!)

At the time of launch, the Xoopit addon, which is available as a Firefox plugin, did not support Firefox 3, but over the weekend, the Xoopit team added that support, which now makes it worth a download...at least for those who aren't too security conscious.

Download Xoopit

For a demo of Xoopit, you can check out this video:

Upgrading the Inbox

Considering how much of our days, if not our lives, are spent dealing with the non-stop influx of email, it's nice to see some applications that are helping us make our inboxes more efficient while also mining them for important data. Microsoft Outlook, due to its nature of being desktop software, has always lent itself to the addition of plugins - even social ones like OutSync (facebook/Outlook sync) - but the idea of adding plugins to our web inboxes is still relatively new territory.

Because so many people use Gmail, we've seen the innovation begin there. First there was Gina Trapani's Better Gmail Firefox plugin, which arose from a collection of Greasemonkey scripts. Then even Google's Gmail team got in on the act earlier this month with their launch of Gmail Labs, the experimental features you can enable from your "Settings" page. Although some of those features are certainly less useful than others, the fact that Google is also hopping into the inbox addon game means there is definitely growing interest in this area (and say what you want - those "superstars" are really helpful).

Hopefully, the growth in this area will continue and we'll soon find that Google Labs, Xobni, and Xoopit were just the forerunners of the upgraded inbox trend.