...and no one else telling me. The new Dell Axim 51v is out, it has six or seven different reviews published already, and no in-depth coverage of its WiFi abilities. However, I do know more than I ever needed to know about its battery life (improved due to use of more nonvolatile flash RAM), display capabilities (largely unchanged), and new OS, Windows Mobile 5 (as usual, pseudotechies think backing up old OS data should automatically migrate to new OS formats).
Having read the reviews -- Engadget has a collection of the reviews in one of their blog articles -- I can say it's probably the PDA to get if you're buying new today and have the extra cash.