I was surprised to see my email address on the list. Looking through my password manager, it looks like they have a simple password I stupidly re-used on eharmony and gigasize more than 3 years ago. (In fairness to those sites, I probably used the password elsewhere too, so they aren't necessarily the leak source.) I just hope a Russian hacker doesn't steal my soul mate on eharmony. (Unlikely?)

Nightlies are NOT betas. These are two different things.

Beta releases are milestone releases that represent the closing of bugs. Nightlies are buggy as all hell experiments that change, well, every night.

Here are the nightlies:
http://nightly.mozilla.org/

Here are the betas:
http://www.mozilla.com/en-US/firefox/all-beta.html

The closest thing I can think of is Fedora's multi-seat project:
http://fedoraproject.org/wiki/Features/Multiseat

It allows one computer with multiple displays to have multiple X sessions. Unfortunately it doesn't ship with the latest release. And I don't think it supports sliding an application window from one session to another.

Maybe a bit OT, but BSD can create problems for a company's legal department because it is really just a template for a license. Every variation on BSD has to be vetted individually as a new license. If you use MIT or Apache instead it's much simpler for the lawyers. MIT in particular seems to be the least suspicious to lawyer types. (I think they recognize the name.) The GPL is probably not as well understood as it should be, but once the lawyers have encountered it, they don't have to repeat their work again.

The problem is that the economics of computer repairs don't make sense. It costs money to diagnose the problem. It costs money for the labour. It costs money for the parts. Those costs add up really fast. If your computer dies and you don't know how to diagnose or fix it yourself why take it in for repair if it's out of warranty? Why spend nearly the cost of a new computer to fix something that's probably three years old anyway. Buy a new one and get the store techie to see if he can add your old hard drive as a secondary. Same price, better result. So where's the incentive for stores to keep a well trained repair team? It's the same with everything. When was the last time you brought a t.v. to a t.v. repairman? Either the warranty covers taking it back or you put it at the curb. People just don't get things fixed anymore.