This answer of mine was converted to a comment (we can argue about whether that was appropriate but I'll let that go):
The answer had -1 total votes; presumably that had previous impact of -10 on my rep. I'd expect that converting an answer to a comment would remove the reputation that went with the answer.
Yet my rep dropped by 6 points; I'd expect it to go up by 10. (I'd place a picture of my rep change here, if Vista would let me take a screen snapshot. Sigh). Here's a copy of my rep display via cut-and-paste.
14 today +10 10 hours ago upvote Static code parser for Java source code to extract methods / comments +10 11 hours ago upvote Good PHP Metric tools -6 25 mins ago removed Does C++ already have some kind of reflection?