This user has an unusually large amount of answers where he seems to almost always point to
WPF Application Framework (WAF) - http://waf.codeplex.com
The questions have around a long time so I'm curious if this sort of "advertising" is somehow different than what I have seen discouraged.
A number of examples (not even the tip of the iceberg):
Essentially the website is a collection of samples. And the format for his answers is something to the tune of "see more samples here", or "go here to see examples". Maybe his answer is on-topic. But with a large database of samples it essentially allows for a "closing sentence" where you can promote your website without repercussions, since the samples are relevant to the question. My comment in Razlebe's answer attempts to make this more clear.
EDIT: Found a great thread dealing with this: Limits for self-promotion in answers
Pekka, I think your heart is in the right place, but... This should not be necessary. You're effectively setting up guidelines for targeted advertising on SO - and there's already a system in place for that. One or two self-promoting answers out of 100 might be called a misunderstanding; 400+ is a blatant attempt to get around paying for your ads, and deserves neither sympathy nor "clarification".