Hands down, this series is among my top 5 of favorites to read...and re-read. If you haven't tried the audiobook versions, I highly suggest you try em. James Marters is the narrator and does a tremendous job, though be forewarned that for book 13 Ghost Story, there was a scheduling conflict and he was not the original narrator. They did, however, go back and re-recorded the book with James Masrters and released that version early this summer.
I also read that Butcher has this series planned out to about 20 books, with the last three ending in a trilogy tentaively using the 3 "catch phrases" Harry uses, "Empty Night", "Hell's Bell's", and "Stars and Stones".
I never really got into his Codex Alera series, but I did check out his new book, The Aeronaut's Windlass and enjoyed it.