came up twice today, so I want to learn more about it.

1st example: outdated content was being returned before newer (more up to date) content.

2nd: all these people attend conferences, and hash tag their tweets/plurks. These conferences happen every year and they use the same tags

how can people find content related to a specific year?

i know there's a meta tag for date, but i don't know that browsers index that and use it to sort

if microformats might be the way to go if they catch on even more?

very interesting problem. let me know if you find more info on this.

on top of my head, one good way to do this in the eyes of search engine, and it has nothing to do with markup, is to have a good url

structure. blabla.com/2008/09/23/ex...