I downloaded goodreader PDF reader for iPad ($0.99) and is amazing. it even reflows pdf although it says its experimental. although if you have a PDF file with lot of white space around all the four corners I'd recommend you to crop it to make the experience better. Adobe acrobat does that but I don't know of any other tool. On the side note goodreader also allows you to download docs from most of the cloud service like google docs, box.net, dropbox etc and some more. overall I am more than happy with my iPad. with every minute I am discovering something amazing about the device.
here is the link:
http://itunes.apple.com/us/app/goodr...363448914?mt=8