This is a really neat Firefox plug-in that will allow you to see Craig’s list thumbnails without having to click on the link and go inside.

http://www.craigstoolbox.com/post/Ad-Preview-Extension-for-Firefox.aspx

All you need to do is click on the download button and install like any other Firefox extension.

Once you have the Firefox extension enabled.  Due to any Craig’s list posting and you can see all the images directly underneath the link to the post.