I've had a couple people interested in the collapsable lists that I use for my sidebar links so I've gone ahead and prepared some easy to use files that will help anybody to implement the same. These can also be used inside posts. Just right click on this link and save the zip file to your PC. Inside are 4 text files. Read the one called instruct.txt and it will guide you through setting up your blog to use collapsable lists.

Note that the instructions are tailored to an MT blog with the MuNu setup. I don't know how differently other blogs function but some tweaking may be necessary.

Also, credit where credit is due: This is a script implementation I got from Microsoft FrontPage.

UPDATE: As MojoMark reminded me in the comments, these collapsable lists will not work for Mozilla. At least not up to version 1.4. Future versions? Who knows. The good news is they fail in an uncollapsed format so the worst that will happen is that they show up expanded, even on Mozilla.

UPDATE2: Just encountered this helping Simon get his lists set up. When you create the outline.js script file you must also build it. After you save it there will be a "rebuild" link (or button) underneath the "body" field. Click on that.