I would say no, as AGD is seen by Google as a trusted (non-spam related) site. I have my sig links in place and can't say for sure what value it provides, it does me no harm. The key is to have a wide portfolio (verity) of high quality links.. A few forum sig links includedquestion: i've noticed that when i change my signature- it is changed on all my posts. What effect it has in terms of seo? There are members here with thousand post- can you get penalized if suddenly 1000 links change?