There are comments coming from a previous era of this blog. The one still haunting the Net; generally I have e-mail messages about Blogger Categories; the hack I described haven't be used as widely as I expected, people just don't know what the want ;-)
Last via Haloscan, from Daniel:
Quite nice, but still I don't see any improvement when I compare with tags.
Maybe (even probably) microformats will survive, despite their primitiveness, I may even say, because of they primitive simplicity and great efficiency.