Twitter is useful as a news stream. There are lots of book + digital people on Twitter (booksellers, authors, agents, vendors, publishers, news sources). Here are a couple of Twitter lists to get you started:
You may also want to look at the 995 people I follow (Twitter: @draccah).Create your own news feed.
The largest e-book and digital publishing group on LinkedIn has 6,100+ members talking/sharing about the evolving digital landscape of the book. [just fyi, I run this group with 18 other managers]
While you're here for BEA, be sure to check out, Lunch BEA to go, their new mobile web app with the latest show info and show directory. You can find info at: http://www.publishersmarketplace.com
4. Digital Book World: http://digitalbookworld.com
Digital Book World is a site, a community and also a conference. Twitter: @DigiBookWorld
Tim O'Reilly, O'Reilly Media & TOC have done and are doing great work in this space. Follow them on Twitter, check out their blogs.You can learn a lot. They also have a community and a conference. Web:http://toc.oreilly.com
6. The Shatzkin Files blog: http://www.idealog.com/blog/
Mike Shatzkin's Idea Logical company is a book publishing futurist company, specializing in consulting for a wide breadth of aspects of the publishing industry. Twitter: @MikeShatzkin
7. Booksquare: http://booksquare.com
Kassia Krozser's analysis of our industry is frequently a breath of fresh air. Twitter: @booksquare
8. Mediabistro's ebooknewser:http://www.mediabistro.com/ebooknewser
A digital book news feed from MediaBistro. Twitter: @eBookNewser
9. Teleread: http://www.teleread.com
TeleRead is the longest running English-language site focused on e-book news and views.
10. BISG - The Book Industry Study Group: http://www.bisg.org
The Book Industry Study Group (BISG) is the leading U.S. book trade association working on behalf of its diverse membership of publishers,retailers, manufacturers, distributors, wholesalers, librarians and others involved in both print and digital publishing. Check out webinars and conferences for educational content. Twitter: @bisg
11. IDPF - The International Digital Publishing Forum: http://www.idpf.org
The International Digital Publishing Forum (IDPF) is a trade and standards organization dedicated to the development & promotion of electronic publishing. Twitter: @MikeIDPF
Great blogs from Agents
12. Richard Curtis & e-reads: http://ereads.com
Agent Richard Curtis (Twitter: @ereads) founded ereads in1999 at the dawn of the digital era. E-Reads is the oldest independent e-book publisher in the field and Richard is an innovative leader in the modern book industry.
13. Nathan Bransford: http://blog.nathanbransford.com
Another great agent blog. Check out Nathan's This Week in Publishing. Twitter: @NathanBransford
You can find more great book publishing news (often covering digital) at:
16. Wall Street Journal ? http://www.wsj.com: checkout what Jeff Trachtenberg is writing.
Books are at the center of the digital transformation of media so you'll also find digital book news regularly on The New York Times, Wired, TechCrunch, Bloomberg, Huffington Post, Daily Beast, Mashable and loads more. Have fun. Explore!