My C:\Users\[username]\AppData\Roaming\Bitcoin directory has ballooned up to approx. 17 GB and I feel like this is larger than it needs to be...

This is an old install that has been running since basically v0.3 and has never been modified or cleaned out.

Is there a way I can reduce this file size? and which files would be safe to delete to attempt this? I am ok having to redownload portions of the block chain but I don't want to lose my addresses...obviously (I assume wallet.dat is the only "really important" file I need to keep?)



EDIT: Sorry I realized this may actually be in the wrong forum section...please move this topic if it would be better suited somewhere else