Paul Graham has most of the work done for me: http://paulgraham.com/lisps.html He has A, B, C, D, E, F, G, I, J, K, L, M, N, O, P, S, V, and X - though I certainly can name some dialects of the same letters which are not listed. Not going to really bother on that one, though.

This leaves H, Q, R, T, U, W, Y, and Z, of which I can supply Qi ( http://www.lambdassociates.org/ ) and T ( http://mumble.net/~jar/tproject/ ). Bringing the list of unnamed (for me) to:

H, R, U, W, Y, Z.

That's the best I can do. Anyone else?