The new groups release* feels like a family thing: Brett (ex-roommate) was the UI designer, Griff (ex-roommate) was the primary developer, and the page editing was from the trogdor team, much of which I spent the weekend with.
Code search. The interesting question for you is how you open a regular-expression-based query language to the internets. But really the queries you know you want to ask are e.g. [package:livejournal fuck].
* At googleblog.blogspot.com/2006/10/new-groups-experience.html -- I don't wanna link to it so they don't link back to me.