Here's my initial impression....
lots of the old iphone apps simply do not load or work! the ones that do and only support the iphone size look poor.
now for the killer app! get goodreader right away. this lets you download pdfs to the ipad and view them, even image heavy ones, and this is the great part: for the first time you can actually read magazines in pdf format in an enjoyable way. most pages look fantastic and readable without zooming, but if necessary must tap and presto. Good bye kindle... thanks for the memories. of course when you zoom in, things get a little pixelated but not really bad.
the other made-for-ipad-apps i looked at, like BBC and ABC are great. just wait a couple months until the really great stuff comes.