I’ve been using Tuiomouse on Xp and it works great! The only problem I have is with the right and left click because my setup is a LLP and I often get false blobs.
One month ago I saw a toshiba laptop with touchscreen. I don’t remember which OS it had (XP, Vista or Win7), but it had a transparent mouse displayed on the desktop. The cursor moved in the same direction I moved the mouse (on the touchscreen) and for the left and right click I just had to press the mouse buttons on the screen.
This could be a good solution for some of us that have problems with the clicks using tuiomouse if someone with good programming skills is willing to make something like this.