First of all, I own (next to some other titles) a LucasArts classics collection, and I was so happy to have a way to revisit some of my "childhood" memories through ScummVM

The thing is, Amazon's wishlist is bound to their articles, and I don't really know what you guys intend to do with the donations (hardware, server fees?). So, for the time being, I was thinking about something that was used over at the Amiga Music Preservation site: they simply named their requirements (e.g. getting a new DVD writer for one of their maintainers) and people could volunteer to order the items, which were then to be sent to someone from the team.
So, in case you guys (usually) spent the donations on such things as hardware, why not make a "wishlist" here on the forums, where people can (after getting in touch with you through a PM for instance) order something from the list?
Of course that makes pooling money virtually impossible, so for that I'd indeed suggest something like online vouchers (such as from Amazon). Thus, we users pay your Amazon purchases, so you can spend your money on (possibly expensive) merchandise needed for the project.
Well, just some thoughts I'd say

/jochen