The new map's weird, takes some getting used to.
I like that you can pivot the map and get a "3D image".
Being able to put pictures straight from the album onto facebook etc is handy.
Not really noticed much else.
My gripe is that I needed 2.5GB free space to update, so I had to put a few songs in a playlist and uncheck them then sync it so they weren't on the phone, then once updated I had to check the songs to sync and get them back on the phone which takes an age - it's still going on!