This fulfills a need we've had for a long time at my forum, and it does it very elegantly. I did have to edit the stylesheets and templates to get it to integrate well, but other than that I'm very satisfied.
a realy cool add-on from you - thanks for sharing this with us. I love this eg for realy long threads who peopel post dokumentations like a timeline - now he can make markers like a listed short overview. :)