Joost, the web-based provider of on-demand and live television, launched a browser-based version of its offerings this morning. While users of the service's Mac and Windows software can still get at their channels, Joost's new model allows anyone with Flash capabilities, and a temporarily-required browser IE or Firefox plug-in, to get at the good stuff. Joost is expected to go no-plugin-required next month—nice for those on Linux or non-standard browsers—but for now, it's a bit more hassle-free to watch live or canned television at work, or show a friend that old sitcom episode you were referring to. Joost is a free service; requires a sign-up and (for the moment) browser plug-in.