nope. I find typing on iPhone (like now!) so much faster/better than keyboards already, and the whole touch concept is just too good to waste on a crummy stylus 8)
I love the multitouch interface and have got pretty used to using the keyboard - but I would still love to use a stylus *if* there was any handwriting recognition on the iPhone. I can still take notes much more quickly via a stylus / letter recognizer etc than with any keyboard ...