Well, I believe downloading it would be illegal as Apple still maintains it for purchase on the Apple store. I can't see why it wouldn't run on Intel via Rosetta, but if it does not and you have Parallels, you can run the Windows version (that'd be dripping with irony):
http://store.apple.com/1-800-780-50...Jjeja2IRqN2psZlVU3WZ/5.0.19.1.0.8.25.7.11.0.3
I'm not sure if that is simply limited to the Education store. A quick search over the normal Apple store reveals that the only edition sold therein is the Macintosh version, which as said previously, retails for $79.00. That's a bit ludicrous considering it's essentially a five year+ old product.
But if you're in university, you should be able to order it for 39.00 dollars and use it via Rosetta or Boot Camp/Parallels. I don't believe it's ever been bundled with OS X, but rather bundled as part of the Applications CD that comes with every new Macs (in this case, PPC only; AW is not bundled with Intel-based Macs). At this point, though, I wouldn't pay a dime for AW, as much as it pains me to say it.
If you search enough you can find the installers [for Mac and for Win] on the Internet, not that I advocate piracy. Otherwise, NeoOffice/J is a decent compromise, I suppose.