True Blood is an American Television series based on the Southern Vampire Mysteries novels by Charlaine Harris.  The Show is broadcast by HBO in the US.
The first season started in 2009 and is currently running in its second season.  It is about a small town in Louisiana where vampires and humans co exist after vampires came out of hiding 2 years ago, following the creation of synthetic blood vampires are now able to live in human society but there are still prejudices and a lot of dangerous vampires running around.

True Blood centres on Sookie Stackhouse a telepathic waitress  who falls in love with vampire Bill Compton.  She works for owner Sam Merlotte who is in love with her, but also has a secret of his own.
The series follows the two as they make their relationship work and try to interact in each others very different lives.
The first season won several awards and received critical acclaim

To watch True Blood the following websites give links to stream episodes of true blood online:

Televisiononlineinfo.com
Sidereel.com
Yidio.com

More specific websites that stream true blood are:
watch-trueblood-online.blogspot.com
Watchtrueblood.com