7 Secrets of the 80/20 Blogger - Jack of All Blogs:

"4. Become a Google Wunderkind. Delete your archives.
Review all your posts. Clear out the ones that aren't popular. Google will like you even more than ever. If you have less content but more of it is linked. Guess what? You become an overnight google wunderkind. This is something they don't want you knowing. But it works."

Nice post. All worth a read, but I was particularly interested by this point. I don't know how tongue in cheek he may have been, but it makes sense, and is probably true, but, wow, how come a storm hasn't blown up about this... surely it's against all kinds of Blogger ethics and etiquette and god knows what!! :P

I'm not going to do it, by the way. And I wouldn't advocate it unless you give it a lot of thought first. It doesn't strike me as a good practice. But it is food for thought!