Currently, under the "what is reputation?" help page, we have a list of 7 ways you can gain reputation, and 5 ways you can lose it (receive downvote to question, receive downvote to answer, give downvote, place bounty, be flagged as a spammer/offender).
- accepted answer is un-accepted: -15
- upvoted answer is un-upvoted: -10
- upvoted question is un-upvoted: -5
- post (question or answer) is deleted: lose all rep points gained from that post
Suggestions for wording on that last item are welcome. :-) Also, are there any other ways that I've missed?