I believe a web application could be easily written to give a list of flaggers. You just have to parse the block chain. Just nobody has made it yet.

I agree that putting a flag/down vote is annoying without an explanation.

Flagging should cost something. Someone who goes and flags every one of someone else's posts should see some bad consequences. I just have no good idea how to work it. Probably something like vote power %. Flagging a post more than once a day should lower your flag %. And if you flag a bunch of a single person's post, you should have the % drop by cumulative amount for all the flags.

And maybe, it would just be easy to add to the top of someone's home blog, "Flagger extrordinaire" alongside their reputation number.