We are just starting the process, have been talking to another shop and they gave me their list that they were working with
- SignVOX / ShopVox 
- EstiMate 
- CASper 
- KeyedIn 
- Cyrious 
- Sign Tracker 
- Fast Manager 
- T-Quoter 
- Price It Master 
- Impress by Precise Software 
- Printavo 
- Latitude 
- Shopworks 
we really liked SignVOX but they have now changed to ShopVOX and there are several threads about the change, not in a good way. so that one is loosing ground.
we are going to set up a demo with CASper 
http://www.casper123.com/ this one appears to be promising although a little dated on the GUI
have also been talking with 
GraphixCalc.com as the newest suggestion to look at.
currently we are using a combo of QuickBooks and written work orders.