We launched one of our project, http://offlineclinic.com/ some weeks ago. This was targeted towards health and fitness related stuff, tips and solutions to health problems usually encountered.
This subdomain of ours got listed in google within one hour of its launch / creation. The only steps followed mainly included the steps outlined here:
http://nabtron.com/how-to-get-indexed-in-google-in-less-than-12-hours/
It was really fantastic to know because this was a wonderful experience! as it is considered really tough to get listed in google in less that a day even! Hopefully it motivates many developers out there! :)
Note: It was more appreciating when i asked one of my friend that how much minimum time does it takes to list the site in google and make it appear in google search results, he told me around 2 hours, so , it was nice to know that i achieved it in less than an hour! :)