Humm, you dont find linux to be useable... Well, I guess that depends on what you are useing it for, not it doesnt have a great drag and drop, but that is due to the gui, not linux its self. And some gui's have fetures that others do not. I would be interested to find out which gui you were useing. I personaly dont run linux any more. I have swiched to FreeBSD. But if you say linux is not useable due to the lack of drag and drop, you wouldnt find freebsd to be of any more use. For a gui, I like windowmaker. No drag and drop, heck not even a great start menu. But it is very minimal, quick, and funcitonal. If you are looking for a unix with a well developed gui, go with OS X. It has the power of unix, and the interface that end users can understand.
regards,
~Z~