is there a sequal, or any other show similar to this one? I love xxxholic
I like chocolate millK!
But seriously. Yes there is more, no it's not available in the states. Sorry :(
P.S. Google is your friend. ;)
There is a season two called, "xxxHolic Kai" though as Chocolate Milk Man pointed out, it wasn't ever licensed in the states. There are also a few OVAs that more or less follow certain chapters of the manga, so if by some chance you find them, they would seem slightly out of sync with the series in that regard.
EDIT: Please do not post personal information on the forums. -SH