I think a post last edit datestamp is mandatory, what do you think?
Also I think it might be a good idea to show stickied posts only on page 1?
As someone who edit's my posts a lot, I probably should say yes so I don't confuse people. (I do try to make it clear if I edit it changing something significant after someone has responded to something I said however)
I normaly only try to correct my spelling (english is not my native language), but I dont mind phlowcus suggestion.