someone i know donated, 50 us dollors for the package, 3000 tokens, for me theirs no point in donating anymore, 400 tokens may get you 1000 metal, i can get that by taking a few ops and burning them
As of 6/Jun/2009 there has been a tweak with the donation system!
Heavy Metal and Oil Bucket both give 100% of the world Average of their respective resources and Light metal and Oil Jar give 50% - An increase of 100% over before (50%/25%)
These are subject to change.
PS. you'll get a lot more than 1000 metal for 400 tokens.