Kid Congo Powers. Yoga's post re Cave/Seeds prompted me to think of the Kid. An original member of the Gun Club, part of the best lineup of the Cramps, and a former Bad Seed....so a formative part of 3 of the most important/best underground bands of a generation. And he's now found his voice (i.e. writes songs....not trying to beat a dead horse!)
Dave Cloud - Now known (though usually unknowingly) by millions due to "Trash Humpers" and the Budweisers telly ads....the guy is the outsider's outsider. Musically, I love him.....simple, primal, catchy trash. Unintentional (I think) performance art. THEE most charming man I've ever met. And wonderfully eccentric.
Thee Spivs - Have mentioned them here before. To me (a Bostonian), the Clash were the voice of London in the 70s. To me, Thee Spivs are the voice of today's London.