Show posts in a popup upon hover.
View Craigslist posts without having to click on a posting and then having to click back to get to the list of postings.
When viewing the list of posting on Craigslist (events, for sale, personals, gigs, what not), hover over the post title to have it pop up in a window. Move away from the pop up window for it to disappear.
For the truly lazy.
