"Jake Savin [jake@userland.com] posted in his comments pointers to:

1. a macro: Drop listCategoriesForPost.txt into your Macros folder.
2. the code for your Item template that calls it:  

<%local (adrpost = @weblogData.posts.["<%paddedItemNum%>"]); listCategoriesForPost (adrpost)%>

Thanks, Jake! A better way than mine: logic pushed from the template to the macro." [a klog apart]

I may try this one, too, although I'm more intrigued by liveTopics since it also builds an index of posts by category. (Speaking of which, Marc and Matt - I'll get back to trying the installations as soon as I can.)

Momentary Lapses of Dilution

Google translation option - something I'd like to add to my site.