edit_g - 1:18 am on Apr 1, 2004 (gmt 0) Google press release:
Yeah, I'm thinking april fools:
Speed: Gmail makes using email faster and more efficient by eliminating the need to file messages into folders, and by automatically organizing individual emails into meaningful "conversations" that show messages in the context of all the replies sent in response to them. And it turns annoying spam e-mail messages into the equivalent of canned meat.
Google press release: