I've set up a spreadsheet if people want:
http://tinyurl.com/4k7s2fg
Anyone can edit it, even not signed in. It'll automagically tell you what the note names are for the six strings, all you have to do is give it the name of the tuning and the capo/downtune (negative numbers for tuning down and positive numbers for capoing). I've got a couple sample songs in there right now. (Rock Lobster is entered but I have no idea what its tuning should actually be)
If a tuning you need isn't in the list just add it and it'll work.
It always shows the flat-names for b/# notes, I don't know any way around this, but the note names aren't "wrong" (even if sometimes the sharp name is more desirable).