It would be interesting to talk about web applications and services in terms of the year they “graduated” and went public to the world. IMDB was ‘90; Amazon.com was ‘95; Movable Type was ‘01; WordPress.org and Typepad were Class of ‘03; Gmail was ‘04; WordPress.com, Akismet, Youtube, TechCrunch, and pbwiki were ‘05; bbPress, Amazon S3, and Twitter were ‘06; Pownce was ‘07, etc. It’d also be cool to see a timeline of major web apps.