Bluetooth is awesome, if your other devices are equipped with it as well. Remember, it's only short-range (10-100 feet) from the source, so the only thing it's doing for you on the road is connecting to your car, or Nav, or headset.

I use it every day to transfer contacts between cell phones, file transfer with PC, and headset for almost every call, as well as sending destinations to Nav. Very handy if you use it. If you don't, it's just another bell or whiste.
As for checking stocks, I assume you mean WiFi. Provided you're near a network, you can do almost anything you'd use a PC for online.
Instead of WiFi, I use full data service, which works almost everywhere with Sprint/Nextel, and regularly surf the web or check email (5 accounts) all away from a fixed network. Great for business trips, etc, doesn't require any extra software, & unlimited data is $15/month. There hasn't been a month it wasn't worth it in over 2 years....
HTH.