plaintiger: sorry plaintiger, but MAC OS X is is so slow and for most of common user not so easy to use. Btw, how many applications can you find for Mac? For example when comparing with Microsoft it is minor ammount and not to forget Mac´s are so expensive without getting any added value.
Probably Mac users will not like me, but Macintosh is only waste of money. They have good marketing but nothing more...and security of computers doesn´t matter on operating system but on behaving of user, protection (firewall, anti-viruses etc) so it is very easy (but not true indeed) to say, use Mac´s, you´ll be secured.

temo: first, OS X is not slow at all - unless you're running it on a very outdated machine, and even then it's still usable. i have one 300 MHz Mac notebook that i bought new in 1998 and on which one is not supposed to be able to install any version of OS X higher than 10.2, but which i've hacked to run the current version (10.4.7), and it's a little sluggish but still perfectly usable on there. on my 1.67 GHz PowerBook, and even on my old 450 MHz towers, the OS is perfectly speedy.

second, i've been using Macs personally and professionally for 18 years now and i have never had any problem finding more excellent software than i've needed to do everything i need to do. there is a whole lot more software for Windows, but it's all extraneous, useless trash (99% of it bad games) being sold - if in fact it's being sold at all - for a dollar a box out of bargain bins at CompUSA. the pool of actual useful software is about the same size for both platforms: there's microsoft office-type programs and suites, email apps, web browsers, accounting apps, graphics apps (always superior for the Mac, as the Mac's graphics have always been superior) and the rest is specialized stuff and games, neither of which the Mac lacks. the "more software" argument is meaningless anyway: how many spreadsheet applications do you need to run? one. so what does it matter whether there are four spreadsheet apps you don't run, or fifty? the only software that matters is the software that people use, and that pool is the same size for both platforms, and even includes many of the very same applications. if there wasn't *enough* software for the Mac, the Mac would have died in 1985. but it didn't, and now many people are switching to it because of the superior stability (and increased software availability) of its UNIX core.

and with the advent of MacIntel machines, you can run the Mac OS, UNIX, Linux, Windows, and pretty much any other OS you could possibly want to - and its software - all on one machine anyway. and that machine is a Mac.