I have been using Stack Overflow for some time now and find it a great Q&A site where I have got a lot of help and, I hope, have been able to give back something from time to time. I am now thinking of
- completing the answer to one of my own unanswered questions with a link back to one of my own sites where I offer the missing utility (for free) to handle the task I queried about
- Providing as an answer to an existing question by another Stack Overflow user a link to one of my own sites. I should mention that the original question is more than a year old. I should also mention that one of the answers links to another product which is now a commercial offering whilst the link I would provide is to a product that is still in beta and it is in fact a fully relevant answer to the question "in question".
If either or both of these are going to go down badly with the Stack Overflow community then I simply will not do what I have in mind. In any case, I thought it best to check first.