Google was important but I agree that the first search engine should have been there. IPv6 was also missed there, still not fully operational but it has been there for a while. Internet worms (i.e. Code Red) were also important, they raised some alarms related to security practices in OSs and applications.

AFAIK, Aliweb was the first search engine for the WWW and WebCrawler was the first full text search (in its original incarnation, now its only a metasearch).

They gave Gopher credit for being first in content search, although it was admittedly not exactly "web" search.