Ask HN: Best Use for Spare Domain Names

So I've accumulated quite the portfolio of worthless domain names. They're all top level domains so I suppose they aren't worthless - but I can't sell them for anything.

I'm trying to determine the best use for these names. Right now I have many of them pointing to my active website(s).

If I got a few generic keyword related articles together, built a few pages and give myself back links from some of these domains, would that be a bad thing? Would adsense get rid of me?

PS I know there was a similar ask HN thread posted about what you're doing with your unused domain names, but I'm having a hard time using google or searchyc to locate it.