I downloaded a 30-day trial version of Card Support II for Treo 755p. It's very easy to drag & drop files from Windows Explorer without any card readers - just your sync cable. For $14.95, I think it's well worth the time and convenience. I mainly drag & drop ebooks, work files, mp3, jpeg, and video files into my 2 gb SD card. With this program, I don't have to open multiple programs to do those things. Thanks for the suggestion.
