
No, BeOS is not dead as many will speed to the forums and proclaim.
YellowTAB's Zeta is the true inheritor of BeOS 5's fortune, as it is based directly on Dano/EXP's codeline (which was supposed to be BeOS 6 but was never finished as Be sold its IP to Palm). At last, I got my hands on Zeta Beta-5a, and here is what I found and think of it so far. You might need to have some experience with BeOS in order to follow this article, but screenshots are included to make it easier for everyone.
Well, BeOS's main advantages (fully buzzword compliant) are mostly the technological innovations it brought (some still have no duplicate). BeOS will seem faster in day-to-day (ie not heavy compiling) use than anything on slower hardware. The user interface is quite beautiful and intuitive (IMNSHO). It has real-time video and audio (it was meant to be a MediaOS), so it is theoretically superior to anything else (other systems now lead due to raw speed). Programming for it is supposedly a wonder, and the API has things like BMessage (find the old BeBounce demo somewhere).
It isn't UNIX-based, but it is partially POSIX-compliant. Definitely not open source, though such an effort is underway. Linux and W2K will kick its ass in networking--BeOS networking sucks, even in the leaked stuff.
Overall, it's nice to boot into sometimes, and see what things could have been like. Nice to play 10 different videos at the same time--linux could never do that. Too bad it's dead, and if anything will eventually change that it's OpenBeOS, not Zeta.