Welcome to the world of memory leak Anyway, try flashing it to the latest 2.03 firmware. The memory leak issue wasn't so bad for me, but at times, i am still getting about 60 - 70% memory usage even though nothing is running

Or else, try flashing it to Custom ROMs. Some people do say it helps more as well Else, get CleanRam. Nice lil application to help clear some memory but still, best choice is to soft reset like 3 days once

try this program from htc addicts...the author claims that you won't need to reboot your device using this software...you can schedule to run it also...
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or like what akachester said, install custom roms...this you have to be extra careful and there's always a disclaimer saying flash at your own risk...

memmaid? Never try that before though. Will try and see whether its better or not
1. Well, as far as i can see, the TF3D can only display a MAX of 25 message but if you go directly to the inbox, there are more there
Well, its a good program to have but being honest, i rather reset my phone. There are times when my phone memory reaches 70% on idle and even a thorough scan can only get me to around 64% which is still far from idle. So, if you phone are just barely having memory leak, like <60%, then this program can help but if its excessive already, then its better to soft reset.
Copy the cab file into the phone and install. Then, launch the program and it will automatically clean up the ram and free some memory.

If its hard-reset (restore factory settings), then yes, you need to reinstall. But if its soft reset, then no, the software will still be there.  YOu dont need a CD. Its just a cab file which is a freeware that can be downloaded.

All you need is to connect your phone to the USB and transfer the file to a directory in your TD, then locate the file, launch and it will be installed automatically.