The lights are on
Third-party publishers Konami and Electronic Arts have recently launched their own E3 pages. The latter features a rotating display of trailers and teasers for the upcoming titles Crysis 2, Medal of Honor, Dead Space 2, Bulletstorm, and more. Konami's site has registration to become "honorary members of the press," with a section that promises exclusive content, game giveaways, and "VIP viewing" of their press conference. While you're there, you can also vote in their Daily Konami Mashup (today's is Simon Belmont vs. Richter Belmont).
These pages are sure to fill up with info and media once E3 officially begins. You can find EA's site here and Konami's site here.