I came across this Radio Shack Scanner Index a while back and stumbled across it again. Although, not all inclusive it has a lot of good info - specs, manuals, tutorials, & parts lists.
Another good reference for all types of scanners is Anthony Haukap's Site and the file area of his Yahoo Group. A lot of the overall site is geared to the St. Louis, MO area, but there is some good general scanner information available.