Hubby and I got into True Blood at the beginning of the second season of the show, it is now in it's fourth season. He decided since I like to read, and the show is based off a book series he would buy me the first book to see if I would enjoy it.
Turns out I did... and I got hooked. In the last two weeks I have read approximately 3500 pages of Sookie Stackhouse. There is an 11th book out, but it is in hardback, and is $20 more than the paperback version, I can wait. So here is what I can say about the book series:
There are some MAJOR differences between the book series and tv series. I like it because even though the overarching plot of the book tends to make one series, they don't always go about it the same way. It's kind of like those old books when you could choose the ending and how to get there, so I like how it is different, so I don't really know how the book will end. PLUS, the picked the actors VERY good (at least for Alcide and Eric-- Yummy and Yummier!)
If you are okay with the shows and books being different and you like the show series I would definitely recommend reading it. I am currently about half way through Angela's Ashes.