Have you tried installing Widsets on your mobile phone? So far there very few applications, but we might get to see more of them soon. I like the Push Email and chat feature applications.
Best is the custom chat application. The connection is via GPRS and you can chat with your friend who has a GPRS connection. You get an exclusive chat window and you can pass on the link to your friend. Instead of multiple sms exchanges during a match or race, this is better. And cheaper 😉 Check it out!