I've been using the Sandisk Connect Wifi card in my Zodiac 2. It works very well, and is quite a bit faster than I recall my Sony Clie NX70V with the WL100 Wifi card. Wifi on my Clie was one of the things I missed most, but not anymore
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Tapwave's free email client works with Gmail's POP3/SMTP feature.
If anyone has any questions about Wifi on the Zodiac or the Zodiac in general, feel free to ask.
Brian