2004 - 8 HR in 82.2 IP - 1 HR every 10.23 IP
2005 - 9 HR in 74.1 IP - 1 HR every 8.23 IP
2006 - 13 HR in 73.1 IP - 1 HR every 5.62 IP
Now, in a spacious ballpark like RFK, that sort of jump in HR allowed really worries me. And I know it's possible that they weren't all in RFK, but what will that translate to in Fenway, the land of 315 foot pop fly homeruns?
edit - Compare that to say, Mike Timlin, who gave up 2 HR in 80.1 IP in 2005 and 7 in 64 in 2006. Yes, it's also a sizeable jump, but I think Timlin's woes were due to injury and I feel he will bounce back as a very serviceable reliever in 2007.
double edit - I've been beaten to the punch. But the numbers are all the same.