How/where do I upload my .blend file comes up all the time. I suggest adding a button/link to http://blend-exchange.giantcowfilms.com/ for uploading a .blend file above the text box with the other options like B, Italic, Hyperlink, etc...
I think this is a great idea, but we'll need to get SE to add this. We don't have control over much of the help center content.
I propose adding something like this at the end of the "how to ask" page:
- Help us help you
If your question involves troubleshooting strange behavior, the fastest and simplest way of finding the answer is often by providing a blendfile and/or screenshots for others to examine.
How to Ask
Is your question about blender behaving differently than expected?
Chances are, the fastest way to find an answer is by providing a blendfile for others to examine. If your file is especially large or you don't wish to share its contents, try to pare it down by deleting extraneous objects and/or replacing the actual meshes with placeholders.
Please feel free to edit these and improve wording etc, or propose your own in another answer.