I'm perfectly happy with rye iPhone keyboard, why typing on it now. Not sure that a real keyboard would even be worth the bulk.
What is killer about the Pre, is the multitasking features.
Don't get me wrong, BOL, I like the Palm and have used them over the years (Currently using a RIM STORM and I like it, it spite of the bugs), but I don't type a lot on ANY phone system, and love the screen for reading email... but I digress.
The Palm Pre looks impressive, but it seems to me that if you hold it on the bottom to type, with your hands gripping the back and your thumbs happily hitting the keys, it will be top heavy and tip over...or just as bad, bounce on the down strokes. I hope I'm wrong, but physics may overrule cool, as it often does.
Let us know, once you get your hot hands on it...