dickbaker - 10:55 pm on Jan 18, 2011 (gmt 0)
Yesterday I received an email from a webmaster in which he pointed out at least four links on my links page that went to 404's. He then asked if I would consider adding a link to his relevant site.
I was so grateful for his extra effort that I added his link without requesting a reciprocal.
I don't know if that's his MO, or if he just noticed, but doing something for someone first before asking is always a good idea.