The tag generator tool I tried uses a "www" in the Technorati URL for the tag link. I've seen other blogs on Technorati which have clearly used that tool and they're still being indexed.
I'm trying a(nother) post now without the "www" (I'd already got rid of target="_blank" in case that was getting in the way). It's now (though it was before) EXACTLY as they say on their pages. Including + instead of %20 for phrases (even though that seems to work to access the pages generally - it's just not getting my posts onto their tag pages).
I need my lunch.
Technorati Tags: Weeping, Wailing, Gnashing of Teeth, Banging Head Against a Brick Wall, Improbulus