I LOVE this series!! I love that Hearne has added something a little different to the urban fantasy genre and really love that he plays with multiple pantheons. Atticus is such a great lead character - he's not nearly as dark as most urban fantasy characters are which makes the stories easier to read.
Tricked can be read as a stand alone - explanations are given where necessary to catch the reader up - but why would you want to? Go, read this series - NOW. You'll be glad you did.