Got a tough question about mass spec? Have you checked the ABRF message board?
This is a resource that I definitely don't use as much as I should. It gets mentioned on the blog here and there but it is always good to remind people how awesome this is.
The ABRF message board is a great place to go when you've got a tough mass spec question or even places to post your success stories. This community has been active for a long time and some seriously skilled technical experts moderate and contribute to this resource. You can access it here.