I don't know why you people find it so hard to believe clueless, I mean, it's not that hard to do, look, below is a screen shot of my memory usage, phear my leet phone RAM commanding tools of not usings!
As you can see, my phone is running with 100% free memory and it's fast as an auctioneers voice. What is causing your phones to use up all your memory are all those unnecessary "cabs" that you install. Here's what I do, just go into the registry and delete everything, that will free up tons of RAM for you. I would make a cab to do it for you, however, then the cab would take up memory, and then it would become some sort of crazy paradox and then dogbert would make money off of it somehow I'm sure...
This troll has been sponsored by your local blood bank: because we're all out of money for banks!
Seriously, all in good fun guys :P
Oh, and don't try this at home.