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Hardly a day went by this week without a major new announcement in the eBook and eReader arena. The wireless eReaders from Sony and the Irex/Barnes & Noble partnership were probably some of the most interesting announcements. In addition, Google also opened up its EPUB archive, which will give readers easy access to over 1 million free public-domain books for their eReaders. The only company that didn't have anything to announce this week was Amazon, which is now in danger of losing its early lead to Sony and Barnes & Noble.

All the major eBook vendors are currently trying to expand their eBook and eReader line-ups as fast as possible in order to compete with Amazon. Today, Barnes & Noble announced that it has partnered with Irex Technologies, a Dutch eReader manufacturer. B&N will sell Irex's new consumer-focused device in its stores and online later this year. B&N already signed a deal with Plastic Logic earlier this year. Irex already offers a number of different eReaders in its store, but this device looks to be specifically designed to take on the Kindle. It will feature an 8.1-inch touchscreen with stylus navigation and a 3G wireless connection.

According to a new report by Forrester Research's Sarah Rotman Epps, eBooks and eReaders are slowly but surely becoming mainstream. However, while Amazon is the current market leader among early adopters of this technology, Rotman Epps predicts that later adopters will not feel the same loyalty towards Amazon. This, according to the report, will open up a lot of opportunities for other players in the market, including Sony and large mass-market retailers like Walmart.

Sony just announced that owners of the Sony Reader can now access over 1 million free, out of copyright and public domain eBooks from the Google Books library. Sony first announced this deal with Google earlier this year, but at that time, it only offered about 500,000 free books. Barnes & Noble, which announced its eBook store and forthcoming hardware eReader last week currently features about 500,000 free books from Google, while Amazon's Kindle can read free books from Project Gutenberg, but doesn't offer compatibility with the ePub format that Google prefers. Amazon currently offers about 300,000 books.

Barnes & Noble, the beleaguered online bookstore, opened its eBook store yesterday. That, by itself would be a major news story, but B&N also announced that it has partnered with Plastic Logic, which is expected to release a highly anticipated Kindle competitor soon. For now, eBooks bought through B&N can be read on PCs and Macs, as well as on iPhones and Blackberries. While iPhone and Blackberry apps are nice, though, no eBook vendor can really compete with Amazon without a good hardware eReader that is integrated closely with an eBook store. Given that B&N seems to have all of the necessary pieces in place, however, we think that the the company can indeed challenge Amazon, especially given that it offers a larger selection of books and plans to offer a device that is more open than Amazon's Kindle.