MySQL FullText Search shall be used in b2 v0.5, next week. This kind of search function goes beyond the simple LIKE statements... but will require a database-update script.

Comment, comments: just thought about a template tag for the word "comments", that would take 3 states: 0, 1, or more comments, with an user-defined text for each state.
Besides, even cool weblogs got the "1 comments" flaw, heh