Make sure you're actually using the storage card. Install programs onto your card instead of the device and move files over to the card as well.
Try these:
- Use the hacks to move mail and Internet Explorer temp files and cache to the card.
- Set your camera to store pictures and video on your card (under options).
- Reinstall your programs onto the card (if the card is funtioning correctly in the Q the option will come up asking if you want the app on the device or storage card (default is device).
- Clear out your temporary files with something like SKTools or go into IE and clear them out under options.
- Move files like music and such over to your card.