Hi and welcome to the site. There is a ton of info here that will get you started... Here's a thread on
Essential Treo apps. Check out
Softick Card Export II which allows you to mount your SD Card like a hard drive. You could also go with a USB Card Reader.
Enjoy. Have fun. If you have questions, post'em in the
Treo 650 forum.
Thanks for registering and becoming a member of Everything Treo!
-Chris