whatson - 6:24 pm on Nov 11, 2011 (gmt 0)
Look if you are doing it right then you are going for the right links anyway, related, useful web sites. Think of it as more will their visitors find your site useful and even pass some traffic your way. You should be able to tell what a quality site is.
Anyway, it wont hurt you either way, there are only a few link types that could potentially hurt you, and you can tell them very clearly.