Ready to try Flock, the Mozilla-based social browser? You can now download a developer's preview and give it a spin. The alpha (excuse me, developer's preview) runs on Mac, Windows and Linux, and seems relatively stable. It has built-in blogging, flickr and del.icio.us posting tools, and allows one-click tagging of web sites. Since the public bookmarking function is built on del.icio.us, there's already a huge potential Flock community out there. If you have a blog, regularly use flickr or save your bookmarks on del.icio.us, Flock may be just the thing for you; it even supports some key Firefox extensions, including Adblock and Greasemonkey. It may not become your default browser, but Flock is definitely worth a try (even if you're not a developer!).