How to report probable bugs or quirks to WRI? What is the standard way to do it? Is there a known list of bugs maintained by WRI? Can we track the status of bugs anywhere?
Bugs should not be reported here on this site. If you know that it is a bug, don't post here, contact WRI about it instead (firstname.lastname@example.org).
Questions about how to work around bugs are welcome though.
(I added this information in the bugs wiki a while ago.)
Note: Please don't use the bugs tag for new questions. The idea is that this will be added to questions when the problem is confirmed to be a bug (based on e.g. community consensus). This tag can be useful for many reasons (being aware of problems and knowing how to work around them---I found myself searching MathGroup for some old bug several times to make sure my code won't be affected by it), but we'd like to avoid new users reporting bugs here or adding this tag to problems they think are bugs but really stem from misunderstandings.
On the other hand I would like to have some tag indicating that OP suspects it's a bug. That's the core of the question, not "notebook" as it is tagged now. But it's only indicated in the title, which IMO is not the right place.
I'm for a bug-possible and a bug-confirmed tag. The first one is a better indicator of the status than simply bug, and I would feel invited to test OP's code to see if I can reproduce reported behavior.
I would incinerate the bug tag.
edit (re Mr.Wizard's concerns)