There are 500 titles available, and they are priced at $1.99 each. From the press release:
Marvel Entertainment is proud to announce the launch of the Marvel Comics App for iPad on the App Store. This landmark app launches with over 500 of Marvel's greatest comic books, from classic stories to modern tales, featuring Iron Man, Captain America, Spider-Man, Hulk, Thor and more of the world's most popular Super Heroes. The Marvel Comics App brings the world of Marvel to iPad owners with each comic presented at incredibly high resolution possible on iPad's full color screen, a user-friendly search engine, innovative viewing options and mor
Xeni Jardin of BoingBoing was one of the select few to get an early iPad, and she took the time to post a video on Youtube.
Nate Hoffelder is the founder and editor of The Digital Reader:
"I've been into reading ebooks since forever, but I only got my first ereader in July 2007. Everything quickly spiraled out of control from there. Before I started this blog in January 2010 I covered ebooks, ebook readers, and digital publishing for about 2 years as a part of MobileRead Forums. It's a great community, and being a member is a joy. But I thought I could make something out of how I covered the news for MobileRead, so I started this blog."