Lenovo's latest video driver for the X61T is dated sometime in June. I've been having a lot of problems with my video driver "stopping" and "recovering". It gets pretty annoying. The driver installer on Intel's site won't install on the X61T. It says to get the driver from the OEM.
I took a look on Intel's site again recently to see if there was another way to get the drivers and I noticed a zip file you can download.
Once I got the drivers extracted I went into Device Manager and updated the drivers manually. I haven't had a video driver stop message for about a week now, so it looks like these drivers fixed my problem. By the way, this is Vista X64.