Wired reviews Palm Treo Pro. Verdict: stylish, not very good
Good is its slim form, decent camera, battery life, real headphone jack, turn-by-turn GPS and the fact that, as an unlocked machine, it belongs to you, not your carrier. Bad are the touchscreen, laggy menu navigation and its "greasy" obisidan finish.

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Link in the post isn't a URL, the story seems to be at http://blog.wired.com/gadgets/2008/08/review-palm-tre.html
I finally replaced my old phone with a Palm Centro last month and am very happy with it (and the Palm OS). It seems that Palm is vacillating between using Palm OS and Windows Mobile on its new phone, hopefully they'll keep making some models with Palm OS (or that Window's Mobile actually becomes a worthwhile OS for a phone).