Found a data base of wheel weights
 

So, I do not know if anyone has seen this before, but I thought I would share with everyone just because I am trying to find some weights (Sadly the wheels I am interested in knowing the weights of are not listed, this list is a few years old now) but it could be useful for you guys as a quick reference. Here you go

Link (PDF)

Here's their website: http://wheelweights.net/

It's still outdated but a little more up to date (3 years more up to date).

Thanks Dave! Good info for people.

Added the link to the Wheel Directory important links list. Thanks!