I have to add one observation here. I agree with mouser that there is technically nothing wrong with what OC is doing. But I also understand what kartal is saying, and I do have one foot partially in his camp. That is, I'm not as committed as he is to the idea, but I lean that way more so than the way of OC.
Now, Dr. Apps is saying all the right things regarding OpenCandy to satisfy the suspicions of the predominantly ad-unfriendly atmosphere here. But I'd like to point out that you end each post with:
Dr. Apps
Software Community Guru
OpenCandy
http://twitter.com/drapps
Big deal, right? Well, this kind of mimics the situation we are discussing. Why do you put this at the end of each post? This forum already allows for a signature field. The signature field can be turned off in each person's user options. So, by you not putting it in the signature, but in the actual post, you are bypassing the intent of that feature of this site. Sure, you are not doing anything wrong, but your intent is clearly subversive. This is the same kind of annoyance that we as users feel with things like OC for installing programs. Yes, technically there's nothing wrong with it, but it's annoying. Clever, is the most positive word I can use for it. My opinion is that the amount of "good" that comes from OC is pretty minimal.
But again, I want to emphasize that it's not an issue I would really take sides about. I would more likely just roll my eyes to OC and think "Cmon, man, you know what you're doing. Maybe you have to do it, we all have to do things we don't absolutely love sometimes to get through life, but don't pretend like it's this great thing."