Rob,
Thanks for the plug. Of course now Ihave to go deflate my ego a bit!
Mudcats is a relative newcomer to the calibration management software arena. I have not heard anything bad about it so far. Edison ESI developed it. ESI has a NVLAP accredited calibration lab. Talk to Shannon over at Edison ESI. If she does not have the answers to yur questions, she can get them.
The other dominant players are CyberMetrics, makers of GAGETrack, and Blue Mountain Resources, makers of Blue Mountain. Both are good packages also, and between the two, they have the lion's share of the COTS (Commercial Off The Shelf) market.
GAGETrack runs MS Access in the background. I believe Mudcats and Blue Mountain run SQL in the background. Blue Mountain is also optomized for PDA use, making it highly portable.
I recommend getting a demo version of each, put the demos on a stand-slone computer, and have the folks who will use the package day-to-day actually run a side-by-side comparison. Select the package that best meets what you need.
Ask each of the developing organizations if their package includes an uncertainty calculator. If not, I know a good one available at no cost.
Hope this helps.
Hershal