While we're at it, let's credit some of the songwriters Tom has covered (and helped bring to our attention).
Wesley S. mentioned Hobo's Mandolin, written by the great Chicago song-writer Michael Smith. I think Michael called it This Old Mandolin.
The song mentioned by Kevin, Duncan and Brady is probably a folk song, but Tom's version is a cover of Spider John Koerner's.
Lefthanded guitar mentioned Joshua Gone Barbados which I believe was written by the late Eric Von Schmidt.
Child's Song, also mentioned by Lefthanded guitar was written by Canadian Murray Mclachlin (Sorry if I mis-spelled your name Murray)Appropriately, I don't remember who wrote The Remember Song.

As was mentioned above, when Tom Does decide to perform one of his own songs it's what Guy Clark calls "a keeper" like No Regrets.

A great thing about Tom's live show is his between song patter. Right up there with Utah Philips, Gamble Rogers, Fred Eaglesmith, Hayes Carll...