I know that XHTML 2.0 and HTML 5 are in the works for quite some time and I'm still confused by these two... As adopter of XHTML 1.x, my gut says to go when XHTML 2.0 over HTML 5 (when they are out of course). All I've seen about HTML 5 so far, was more multimedia oriented and I don't develop much of those websites. But I haven't seen that much about it either one of them. Still, I think that XHTML 2.0 seems the way to go for someone that mostly developed websites in XHTML 1.1.