Something that Kevin Burton recently wrote triggered an idea:

PPS. I used tinyurl.com for the URL to shirky's article so it wouldn't be included in pagerank, daypop, etc. I'm going to start doing this to articles I find suboptimal. Consider it a negative cert (or lack of approval).

That's a great idea! What if we had a tinyurl service that let you write urls like this:

http://thisurl.is/great/123456

and

http://thisurl.is/crap/567466

Typed hyperlinks without any new syntax. Google and other citation based systems would quickly be able to latch onto these and adjust their rankings.