I've asked a bunch of questions that I have either followed up the advice given or am about to. I'd like to provide an update on the outcomes. Is the best way to just edit the question with my new information?
Simply edit the question with the new information; updates should naturally go at the bottom of the question, unless the nature of the question has radically changed.
Remember that we retain all edits in revision history and anyone can see the date of post, and the date of the last edit directly on the post itself.
I also recommend leaving comments on the answers indicating any specific followup or commentary on how those answers turned out for you.
I would recommend something like:
## Update (2011-07-31):
Tried out Bob and Alice's suggestions to fiddle with the whoozawhatzit
and now the thingamagig is all out of whack.
Which will render like:
Tried out Bob and Alice's suggestions to fiddle with the whoozawhatzit and now the thingamagig is all out of whack.
Maybe also comments on the specific answers.