Planet13 - 4:53 pm on Aug 6, 2010 (gmt 0)
Thank You, cnvi and mgravlee, for your suggestions.
I will definitely make them dofollow, relevant, and useful to users.
As for reciprocal links, I do "suggest" it to them AFTER I have approved their links already, just saying something along the lines of, "If your visitors might find our site useful, then you might want to link to us."
I guess the thing is not to have so many more reciprocal links than one way inbound links that it looks unnatural to google.