Really slick PDF reading app. It's got text reflow with scrolling, so you don't have to pan the screen around at all. The only way one could possibly read ebooks on an iPhone.
This is a must have app for all who uses the iPad. At least until Apple corrects the who issue of original content sharing between the iPad and everything else.
Access your documents pretty much anywhere you store them. Works great with Dropbox and Google Docs. Cons: Web-browser based downloading is a little annoying to interface with.
The bet application for the Ipad. I use it daily and cannot imagine using my Ipad without it. Great for transfering your files between your computer, smart phone, and your Ipad. Cons: None. The best that is out there.