Steve Rubelis down on Flock (something I haven't seen), but that's not really the point of this post. Here's the snippet from Steve that I want to look at:

Last night I tried out Flock, a new Mozilla-based browser that's getting a ton of buzz. The press is chiming in here too. Originally just a handful of people were invited to try Flock, which is in developer preview. Unfortunately, Flock installers quickly spread around town and the company released it out to everyone to try.

That last bit is important - Flock installers quickly spread around town. The error made by the Flock people is in the assumption that you can make a limited release available on the web. If you have something that well read people are going to look at - and comment on - then it will stop being a limited release within a few minutes. Which might be a problem, depending on whether your stuff was really ready for general release.

Bottom line - there's pretty much no such thing as a limited release anymore.