http://www.duinoaday.co.uk/shields.html
The pin usages are not all defined as you will see but that is the best list of shields.
Some shields are still on my list to add too.
If anyone wants to find out what all the pins are on all the shields then I will happily add it on/create a table for it.
The problem is that often, that info is not stated, they just work. If you want to know what pins they use, you have to work it out.
Mowcius