The good news, or the bad news, depending on how you look at it, is that it might be much easier to ask 'what tools don't we have yet?' From Tom's description of a conversation with Bellingham Public Library, what seems to be needed most is an infrastructure for collecting and processing tool requests. I narrowly escaped buying a coil roofing nailer recently, anyone? I have two boxes of crown staples for which I don't have a gun. I think it is possible to set this system up virtualy via email alerts. Members of the group recieve an email, the subject of which is 'looking for roofing nailer'. Let's try it this way for a while untill it grows out of hand, then think about adding a more structured approach to deal with the unwieldy volume of traffic.
Remember that the "Community Asks and Offers" Group was created for this purpose: Requests and offers of goods, services, tools, etc.