iMemory Enhancer uses virtual memory to add a little more memory to your iPhone or iPod Touch. This ultimately results in slightly better performance.
Add our Cydia repo to Cydia: gumballtech.com/cydia
Install iMemory Enhancer, reboot, and use SBSettings to free-up memory from the Processes toggle.
[UPDATE!] Our repo has been closed. BUT, you can still get iMemory Enhancer. Simply go to the repo URL in your web browser on your computer (or iDevice) to get it.
And try this at your own risk! It's reported to work great on most people's devices, but messes up others. If yours gets messed up, you'll have to restore.