I almost ordered one, and still really want one, but got cold feet when I failed to find evidence of a way to get my own (read: not through Apple's eBook store) eBooks on and off the thing without iTunes - I'm a Linux user.

Unless someone on HN happens to know whether it's possible to use the iPad's WiFi to move data or eBooks in particular?

I thought the iPad's web browser might work, but if Apple decides to restrict its download mechanism or not have the downloaded books show up in the eBook reader, that might be a problem.

I'm probably worrying too much, but I'd hate to end up with a ~$800 device (3G) I can't really use much for the primary purpose for which I wanted it in the first place.