Search vs Tags
Fred Wilson says:
"...As my friend and former colleague Seth Goldstein points out in the Hansell piece, there is a lot of "innovation among smaller sites in using blogs and other methods to associate, or tag, Web pages with information about their content".
It will be interesting to see how Yahoo! and Google incorporate these new developments into what they are doing."
It's an interesting point I've been thinking about lately. Tags/massively distributed filters/etc will, if things don't stall, at some point become a substitute for (at least some significant portion of) traditional search. When this happens, goog + yhoo will have either built their own competing techs, or will be forced to acquire.