I'd rather call it "dual-platform", and I wish they'd add a native Mac version to make it really multi-platform.
I tried to go the Win/Linux route, but after experimenting with Mandrake (pre-Mandriva), Slackware, Vector, Mepis (pre-Ubuntu), Ubuntu, Zenwalk, Xubuntu and some more obscure distros, I've pretty much given up on LInux after running into bugs, cryptic configuration and severe problem every time (although I'm still planning to set up a Xubuntu machine for my dad just for surfing and email). And the apps are even more immature and buggy than the distros, IMO. Look at Abiword, for example. For general use and if you have a halfway decent machine, a Linux box with a recent distro and KDE and OOo might be nice. But not on my machines.
If I still had a Linux and a Windows box, TextMaker would probably be the word processor of choice for me (OOo is too bloated and didn't feel right when I tried it quite a while ago). Right now, for €14, TextMaker could be fine just for Windows and thumbdrive as a stand-by solution. If the bibliographic features are of any value (very important for some projects of mine ATM, never tried those on my test drives with TM), it might even draw me back to Windows (not: Linux) completely.