I recently was tasked with converting a Tumblr blog into WordPress. On Tumblr, or at least on the theme I was dealing with, they have a pretty fancy archive section that lists all the posts as images underneath the months. If there aren't images, then it shows a little text. To do something similar...
Recently I had to transfer all the blog posts from an old 2.4 version of WordPress, to a new 3.0 install. After I exported the content (via Tools > Export), and tried to import it into the new blog, the importer froze up and never completed. I was surprised to notice that the XML file was 50MB. Opening up the file in Notepad++ revealed that this was all spam. Apparently the blogs spam comments had never been deleted and there were over 10,000 spam comments!
This jQuery script will automatically hide all excess list items past a maximum number. It then dynamically adds an expand/collapse link that uses the slideToggle effect. Each list item is collapsed in succession to give the appearance of using slideToggle on a container. The max number, speed of animation, and expand/collapse HTML can be passed as options.