I've been working on this over the weekend:
list of all forums that link to HomemadeTools.net
Had no idea it would be so long. Turns out we have hundreds of forums linking to HomemadeTools.net, and I've found 500+ total links just from forums (I have a separate list of blog links; not sure where I'll place it yet). I picked screenshots from some of the best 100 forums, and put them at the top.
The funniest thing was the shared theme among so many of the posts: you'll waste hours here, you'll quit your job, don't blame me if you can't leave, endless browsing, etc. I think it's a combination of wide appeal, plus a deep repository of tool ideas that can't be consumed quickly, even by experienced web users.
If you've posted tools here over the years, and wondered if people on other forums really cared, now you have your proof.
Did I miss one? Let me know and I'll get it added.