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Try Lotus Symphony. I've been using it on os x as an alternative to OO. Its pretty good.
I like Symphony, but on a mediocre system like my netbook (which I am forced to use as my main system until I replace a power supply in the Beast) it tends to choke. LibreOffice, so far, runs fairly well under WinXP on it, and I'm using Ubuntu 10.10 for the time being on the *nix side so I've got OOo there. Then again, my few and far between office software needs could be adequately supported by Abiword and Gnumeric, if there were stable working versions of both for Windows. Abiword runs great on the XP side of this machine but Gnumeric is a bit unstable.