Guerilla Gigging
First, let me say that I think the whole flash mob thing is really, really dumb. I mean who wants to see a bunch of dipsh!ts standing around pointing at the sky.

However, some punk bands in Britain have put an interesting spin on the idea with spontaneous concerts that are being called "guerilla gigs."

Basically, the bands use SMS, IM, e-mail and online forums to announce shows that may take place within hours. For many bands without major label support, this is turning into a great way for them to build a loyal fan base. Check out this WIRED article for more..