I concur with PG. An "Edit" option whereby you could edit old posts without reposting them would be a godsend.
This is particularly true for me as it appears, for some bizarre reason, that all the quotation marks from all of my posts from before a few months ago have mysteriously disappeared. I think some apostrophes and hyphens may be missing as well. This is problematic for two reasons;
a) It makes my earlier posts look even worse than they already were.
b) I've quoted some pretty unpleasant people in my posts, like Ann Coulter and Adolf Hitler (who is almost as right-wing as Ann Coulter!) for example, and it may now appear that quotes from others are now my own opinions. Not a pleasant thought.
Ideally, I'd like to replace the all the errant punctuation without either needlessly re-posting or losing a substantial chunk of my helpfuls.