FWIW Office 2008 for Mac is developed by a separate division at Microsoft, the Macintosh Business Unit (MacBU). Good guys in a bad guy world ;-).
Microsoft only offers one other cross-platform app that I can recall, Microsoft Expression Media, purchased from the makers of iView and named after another acquisition (Creature House's Expression). So it was already running on the Mac; by some miracle MS left it that way.
To offer a slightly different view - Apple bought Logic and simply ditched their long term Windows users. The programme that became Final Cut was originally cross platform, though not released, Apple bought it as as protection, but then did some great things with it . Apple I'd say are the far nastier and more controlling of the two, it's just that Apple weren't as good at computers for business as MS and generally lost the plot in the 90s, so are seen as the sympathetic underdog. Though now with the iPod, iTunes and iPhone, they are are anything but now.
And Apple offers just iTunes, Quicktime and Safari for the PC all inferior to other software available on the PC, so MS actually do far more software of substance for the Mac than Apple do for the PC, with both an Office and a graphic design suite. Though Filemaker's owners are owned by Apple and is cross platform, but interestingly it was DOS in it's origins, despite it's Mac start. And if Office for the Mac hadn't been kept up by MS, it may have finished Apple off when Apple were strugging. MS also gave Apple cash to keep going when Jobs returned to Apple.
And at end of the day Gates is spending his ill gotten gains on the poor and desperately sick people, not just buying more high tech shares and black polonecks! So MS is certainly the 'nicer' of the two. Anyway all businesses are more like psychopaths in their behaviour than fluffy, grass munching sheep.