One of the tricks I like to use frequently with my Tbolt and even previous android phones is the voice search.
I was driving home from work last week trying to decide what to have for dinner. I got in my head that I wanted some Buffalo Wild Wings. Well being that its a bit hard to type in the search while driving (unsafe too!) I grabed my phone hit the google voice search mic icon and told it "buffalo wild wings, Southaven Mississippi. . . . . It searched, listed the phone number, I tap the number and call in my order!
Just a closing FYI, from web pages you can tap on phone numbers to call or addresses to navigate to also.
If you have friends or family thats got an android device I would also recomend the free app call Tikl. It is a push to talk app that works just like walkie talkies. I THINK it may work cross paltform to Iphones now too, but dont hold me to that part.
If your car has the AUX port for plugging in an MP3 player, you can use it to play the music off your Tbolt. . . .
Like everyone else has said, explore the app market. Find out what works for you. Be sure to read reviews of the app before downloading. A lot of times you can find out that app wont even work with your model phone or any other usefull piece of info related to it.