cypher - 7:40 pm on Dec 13, 2000 (gmt 0)
I used different search phrases about search engines, promotion and submission on Excite and Altavista. Some of the 10-20 top pages contained comment tags. I didn't check all pages but about 2-4 of the top 20 pages used comment tags.
I thought that it would be OK to use comment tags if sites about those topics used them.