I use github pages for my blog, disqus for comments. Pages is just a convenient place to host - I have my entries in a git repo, the pages are statically generated with Jekyll, I'm sure I could run it myself if github started doing anything onerous. For comments it's just become too hard to self-host anything given how much spam there is, so I've given in and use disqus in the same way that I've stopped self-hosting email and use gmail.
It's pretty easy to hack a comment form so that there's no real heavyweight craptcha but on the other hand a bot will not know to fill it unless your site is specifically targeted. Security by obscurity. Works like a charm for me.
