Most importantly, are Andrew's stickys able to be resurrected?
ETA: I suppose that the plural of 'sticky' is technically 'stickies'... right? 'Stickys' looks somehow stickier, though.
As CP said, the "How to Write A Query Letter" thread is in the FAQ section and "On Queries and Agents: Information Sources" is in Ask The Agent.
The "Information Source" thread in Ask The Agent has a little more information than the one in the Query Letters forum, so there's no net loss there.
The "How to Write A Query Letter" thread in the FAQ section has a little
less information than the one in in the Query Letter section (I added a few things to the one in Query Letters over time). However, I backed up the "How to Write A Query Letter" thread (for exactly this scenario); I think it's on my hard drive at work. Worst case scenario is defaulting to the FAQ thread, which has 95% of the info the QL thread had.
The "How to Write a Synopsis" thread I have in it's original form, also on my hard drive. I never made any changes to it, so that's 100% recoverable.