I TOTALLY recommend J.R. Ward's Black Dagger Brotherhood! I'm new to the genre as a whole and this is the first series that I started with and I'm SUPER happy with it.
Karen Marie Moning "Darkfever" series. You can get the 1st one free if you have a Kindle or Kindle for iPhone at Amazon.
Kelley Armstrong's "Otherworld" series. The first one is "Bitten"
Karen Chance Cassie Palmer series. The first is "Touch the Dark"
There are more, but those are off the top of my head.
I found a new one recently. Chloe Neill's - Chicagoland Vampires, the first and 2nd book is already out. Some Girls Bite and Friday Night Bites. If you are a fan of Sookie Stackhouse, Jazz Parks or any heroine that kicks ass, you definitely should check this out.
There are TOO MANY paranormal romance suggestions. ~laughs~ A few that come to mind are Kresley Cole's Immortals After Dark series, Gena Showalter's Lords of the Underworld series, Jacquelyn Frank's Nightwalkers/Shadowdwellers series...and many more.
If you would like more, you can check out my blog here and take a look at my side bar. I have a list of fabulous PR authors and their websites.
If you're 16 or older, THE AFFLICTED GIRLS A Novel of Salem by Suzy Witten. (Historical Fiction with a supernatural twist) Just out this week on Amazon and BarnesandNoble.com. www.theafflictedgirls.com You'll never look at Salem the same. If you do read it, Heather, I'd love to have you blog about it. Thanks, Suzy Witten (Author)