Zinc is a full screen browser for internet video. But that description doesn't really do the application justice. Basically, it allows you to watch internet video on your television screen using a remote control almost as easily as a keyboard and mouse. You know, a lot like Boxee. But there's one major thing setting Zinc apart from Boxee: Zinc is based on Firefox. And that's going to make it awfully hard for content partners to detect whether you're using Zinc or Firefox, which means it'll be a lot harder for companies like Hulu to ask Zeevee (the makers of Zinc) to block access.
Zinc started out its life as the interface for a hardware set top box that ZeeVee wanted to charge $499 for. That business model didn't really pan out, so the company split is focus and started working on a $2500 enterrprise hardware solution that lets companies like hotels stream HD content throughout the building and the free Zinc media browser.
Version 3 which came out today has a smoother interface, more detailed information about videos and channels, and content from new sources including The CW, Revision3, and Netflix. You can either install Zinc as a standalone application or download and install a Firefox extension that will let you launch the Zinc interface from within Firefox 3.
Right now Zinc is Windows only, but a Mac version is due out next month.