Basically, I'm almost always within coverage of a WiFi network. What I'm thinking of doing is getting one of these WiFi enabled BlackBerries and using it on prepay (or a cheap On Account plan without BIS at this stage), so I'd only have internet coverage in a WiFi area. I know the push e-mail client won't work, or the e-mail client in general, or weather or Vodafone Compass etc but the browser is fine for me. Basically I get annoyed pulling out my netbook to check my uni classes or Gmail, both of which can be accessed by web interface. This will be even more annoying once I get a proper laptop as well. Mostly, I just love the keypads on the BlackBerries, the fact that they'll sync calendars with a Mac and I like the idea of having the option to get BIS at a later date.
What I'm curious about however is - without a GPRS connection via BIS, will PXT/MMS work? If not..I think I remember something about sending images to PXT phones via e-mail (firstname.lastname@example.org)?