I've let a lot go in the past year as well. Just so many that I either had little sites on there with some simple scripts that filter in things from the link list as well as links to sites in the niche.
Then there are the ones where I just never did anything with.
So sad. Now my rule is that if I buy a domain a blog is put on there that day with at least something being a way to make money.
Ugh. Still just so much house cleaning I need to do with sponsors and sites. It sucks.