Boot Disks and CD

Boot disks and CDs are always useful. I was searching for CD versions a year ago, but never built any. It appears that there are now sites which have better versions than back then.
Digg.com led me to this site: Ultimate Boot CD and Ultimate Boot CD for Windows.

I also recently saw an article about restoring Windows by rebuilding only the Windows directory, somewhere. I should look for that. I wonder how well it works?