Hi, I just found this forum!
A month or so ago i managed to hook my arduino to my cellphone and use it to fetch and send variables from my board to a website.
I put together a simple mobile processing sketch (for my phone) acting like a gprs bridge and setup my arduino to request variables from my website using that connection.
The code is pretty crude and the videos are really bad but the idea is there. . .
Check out http://five.b.oh.googlepages.com/
for some sample sketches, code and other info.
let me know what you think of it.