Sorry, I didn't have the chance to play before...
Here's my "geek where were you"
1) ...When Microsoft released MS Vista and Office 2007 (30/Jan/2007):
Preparing myself for the yearly General Business Meeting at the company at the Club Med Rio das Pedras, followed by a couple of days off.
I was in charge of the organization and planning of the event for 60 people, which was no piece of cake, though I got to travel a lot.
2) ...When Nintendo 64 is released in Europe (01/Mar/1997):
Starting my last year at Colegio Mallinckrodt high-school in Martínez, BsAs
3) ...When the construction of the Channel Tunnel (aka Euro Tunnel) began (01/Dec/1987):
I was 7 and probably waiting for Christmas to come... (see my Christmas post for more info)