What would you change on our site to make it better?
Here's a start: don't use javascript for link navigation. Try browsing Craigslist with javascript disabled and you'll see that the site is fully functional. Then try browsing your site the same way and see how far you get.
Craigslist quickly presents a lot of useful information in an accessable manner. It's successful in part because everyone and everything can traverse their site.
Craigslist on lynx:
front page: http://i606.photobucket.com/albums/tt145/lynxcraigslist/cl.p...
sf bay area: http://i606.photobucket.com/albums/tt145/lynxcraigslist/cl2....
software jobs: http://i606.photobucket.com/albums/tt145/lynxcraigslist/cl3....
specific job posting: http://i606.photobucket.com/albums/tt145/lynxcraigslist/cl4....
Although not particularly pleasing to look at, nothing stopped me from getting right to the information. Now consider menkle on lynx:
http://i606.photobucket.com/albums/tt145/lynxcraigslist/menk...
Unfortunately this is as far as we (and most search engines) are going to get because your links depend on javascript for navigation.