Anyone with a Tablet PC who doesn't reboot it too often will have come across the memory leak in the Tablet Input Panel (tabtip.exe) and TCServer.exe. There are various workarounds - anything from rebooting often to using a BAT file to kill and restart the processes every couple of hours!
Thankfully, Microsoft have released a fix for this issue. KB895953 - Memory Leak in Windows XP Tablet PC Edition
