Two weeks ago I filed a bug report on NetBeans tracker, regarding a bug on the J2EE Project Deployment process which consisted in the incorrect undeployment & deployment of different projects that only shared name prefixes.
I am quite happy to see that the bug was quickly reproduced, fixed and applied to the main development branch for version 6.5 -- that little bastard cost me an afternoon's work of bug-hunting and some application downtime. Nothing critical but still...
Glad to see it fixed. It was a one-liner :)