My take on Flickr/Yahoo, AskJeeves/IAC - what Fred says. In short, IAC is doing a nice bit of arbitrage and picking up AskJ at a song - esp considering it's 6% and growing share of the search market, which has massively high barriers to entry. But it's also a semi-mature category.
Much more fun, for those of focused on innovation, is how Yahoo's acquisition of Flickr's tags and semi-open model (which is what drove usage, which is what drove the acq) will evolve. Will Yahoo be able to really exploit the massive innovative capacity in Flickr's tech model? I have my doubts, but it'll be interesting to watch.