Butcher is by far one of my favorite authors. The entire Dresden series is pure gold. Also, check out Butcher's Codex Alera series. It's a completely different kind of fantasy series, but still awesome.
Yeah- I'm loving Butcher as a writer and have the first 5 books of the Codex Alera series that I want to get to as well but I'll probably take a deep run into the Dresden Files among some other books before I get a crack at that series. Looking forward to it when I do though.