plentyoffish.com has gotten some attention of late because of how well it scales.

It’s written in ASP.net. Neat.

The highscalability.com article has a number of interesting observations. Here’s one that stood out for me:

The development process is: come up with an idea. Throw it up within 24 hours. It kind of half works. See what user response is by looking at what they actually do on the site. Do messages per user increase? Do session times increase? If people don’t like it then take it down.