I use Palm T|X. It might not be as suitable as the one recommended by Rich though. It takes 4 Gb non-HC SD card, but not CF. I have Bible (Greek, Hebrew, ESV), Calvin's Institutes, other online sermons on it (basically whatever books you can find on the web, you can put it in and view them offline). It has movie player, music player built in. You can purchase a separate GPS receiver and software. (Personally I use a standalone GPS).

Brighthand is a good source for PDA reviews.

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Polo
Layman, Chinese Evangelical Church/Independent
San Diego

For from him and through him and to him are all things. To him be glory forever. (Romans 11:36)