Essentially, are questions like "What is a good resource explaining [this specific math topic] in [this specific way]?" and/or "Where can I find a link to an archived copy of [paticular website about mathematics]?" appropriate for math.stackexchange.com? And if not, and you know of a more appropriate place, that would be helpful too.
I think the first one is okay. "Where can I read about X from the viewpoint of general topology? I am aware of Y and Z but in these sources only manifolds are considered, not general topological spaces." reference-request
I don't like the second one. Looks like an invitation for group googling.