Quite a bit of spam accumulated in the site comments. Usually I deleted spam comments within a few days after receiving the comment notification email, but not all spam comments triggered those, so I missed quite a lot. I went back and reviewed all comments and deleted as necessary, so the site should be cleaner now. If I missed anything, please let me know.
In order to combat spam, all comments are now held for review before being posted. This will lead to delays, so we plan to improve the anti-spam measures and remove the need to review comments manually again.
If someone wants to help maintain the site, such help would be highly appreciated! It takes away time that could be spent on improving the software instead...