Almost anythng that you can do from your home pc, anymore, TeeBone. As cellphones have become somewhat universal and the number of people with them is beginning to outnumber the number of people that don't (if it hasn't already) more and more sites are including WAP versions of their sites (Wireless Aperture Protocol ~ site versions specifically for people getting online via a cellphone)
Instant messaging still has a long way to go as doing so via a cell is still generally a slow, tedious process and you'll not want to bother mosttimes unless you really need to tell someone something and have no other way to contact them.
But I can check email, I can read the news, blah blah blah...just on a considerably smaller screen //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif