here's all I know, hope it ocvers everything:
Over the next two years, Apple will be switching from the PowerPC chips like the G4 and G5 (same processor as is going to be in the Xbox coming out) to intel processors. The switch will happen gradually, for the sake of developers. The mac OS itself is ready to run on intel processors. Steve Jobs (big wig at Apple) debuted the mac OS for intel macs a couple months ago on a Power Macintosh running with an intel processor, meaning all of OS X is ready to go on intel. There may be bugs, dunno, since the few intel macs that are out there right now have been given specifically to developers on loan in order to prepare for the future macs that will all run on intel. Apple does not want them available for the general public at this time.
What this means: emulation software should no longer be necessary on a mac- it should be able to dual boot into windows or Mac. the complexities of actually making it happen, though, are not known at this time. Apple does not want its OS to run on windows boxes, I don't know what they plan to do to keep windows boxes from running OS X, maybe a ROM code in the OS.
I DLed safari 2.0 with my OS updates, which is most likely what the problem here- it's not available for stand alone download, and only comes if ou have an OS X update that has safari 2.0 in it.
The windows version most likely lives on in the developer's boxes, so unless you get a buddy who's a mac software developer, odds are that you won't get it. I wouldn't be surprised if a copy has leaked out into the sub realms of the internet though.
APple computers ship with Safari and internet Explorer (5.2 i think for the mac). Firefox is available for the mac, should be comparable to the windows version. Netscape has historically been on the mac since the very beginning, have no idea what the latest versionfor mac is though, since I don't use it these days.