Let's see..... here are the ones I read and can't get enough of....
Laurell K Hamilton has Anita Blake Vampire Hunter series
Tate Hallaway has 3 books, 4th is forthcoming (I've read the first 2 and have the third hidden away for Christmas for myself, lol)
MaryJanice Davidson has a Vampire Queen series that I'm working my way through and am loving for light vampire fluff reading (LOL)
If anyone's wondering who wrote the Sookie Stackhouse books mentioned, that's Charlaine Harris
Then you might also like books by Kim Harrison - Rachel Morgan series about a witch battling demons and other nefarious creatures
And there's also Julie Kenner who writes about a Demon Hunting Soccer Mom
.... I'll let you know if I think of any others! Have fun reading! ;-)