Collection of failed attempts to solve X I've been half-jokingly entertaining the idea of trying to blog about "n ways not to solve P vs NP" in the indefinite future, and in my search came across the How not to solve P=NP? question on cs.stackoverflow. 

Clearly P vs NP is a great starting point, being the source of so much development in TCS. But this got me wondering if there are other problems where people have consistently published their failures, or just any thoughts on why some things don't work. Surely not in papers, unless a strong negative result came out, but probably in blog format (which is increasingly becoming its own medium for communicating science).

Of course, this doesn't seem very practical (unless you store all your progress in digital or easily-convertible-to-digital format), but maybe the benefits outweigh the costs. So the other natural question is, how useful do you think it would be if we started doing it as a community? How often is a failed attemp one (or several) steps away from a success?
I've idly entertained the idea of an online arxiv overlay "journal" of negative results. The idea would be to allow negative results or counterexamples that don't seem suitable for a full publication in traditional venues. It would be lightly reviewed, so that we can guarantee that every paper has at least been looked over and approved by an expert in the area. It wouldn't necessarily be archival or "official", but it would at least be citable.

I think such a resource could be very helpful for publicizing dead ends in some lines of inquiry as well as "folklore negative results" that may not be widely known. I can think of a few examples from my own experience. A main challenge would be in finding and connecting with reviewers, due to the variety of possible research areas involved.

If there seems to be enough interest in this idea from the cstheory community, particularly people saying they'd be willing to submit and to review, then I'd be willing to take a lead in organizing. I'm pretty sure I can find some colleagues willing to join and help organize for the first few years.