I need a new OS for my Thinkpad T40. Can you help?
FrankBlack: Try Linux Mint.  It is based on Ubuntu and adds many of the inconveniently uninstalled apps (Java, Flash, etc.)  For most people it just works perfectly right after the install.  On my X41 Tablet my boot times are in half the time of XP and I have no issues.  Add Wine to run those pesky Windows apps you cannot live without and you are set.  And, of course, it is free.  There are many wonderful Linux releases out there.  If you have the time, try as many as you can to see what works for you.