This was a tip that I find for my Cingular 2125, but it also works for the Blackjack.
Start off by creating 3 folders on your storage card to store the files in. I created "Cache", "Cookies" and "History".
Using your registry editor, you will navigate to the following folder:
HKey_Current_User/Software/Microsoft/Windows/CurrentVersion/Explorer/Shell Folders
Change the directory under all 3 values to point to the respected folders you created.
Reboot and your Internet Explorer files will be stored on your storage card.