I agree with m3n formerly known as nein!. ^^
Don't even think about switching to OpenOffice.org unless you're a very basic office user. I have been using OpenOffice.org for around a year one or two years ago and I don't know why I tortured myself with it... Sure, I wanted to save money on Microsoft Office but still...
OpenOffice.org is almost indistinguishable from Microsoft Office (as confirmed by Revenge =) if you're using around 10% of the MSO suite like most users but becomes incredibly crappy if you are an advanced user.
Don't listen to sebas - OO.o has FEWER features than Microsoft Office and the ones that are already there are oftentimes implemented in a very clunky way - e.g. all the things connected with language tools or the review mode are messed up - I should know because I'm a translator/journalist and work with Office suites (especially MS Word, although I use SDL Trados add-ins and Transit as well) for a living. =)
MSO is probably the only really good thing to come out of Microsoft - if you learn to use it, of course. And by God, I tried out all the alternatives only to hit a brick wall each and every time when I realized after a while that something can't be done in a "competing" application.
More features != better.
Well, most of the time one does equal the other - if you're e.g. a professional writer and need all the features you can get. Luckily sebas is wrong about OO.o features and hence we don't need to rely on this argument. ^^
I haven't done any real comparisons between the two.
Well, I have and above are some of the results. =)
P.S. Sebas, you can save documents as PDF with MSO if you download a FREE plugin directly from Microsoft. ;-)
And don't tell me the plugin will cramp your system since OO.o uses about twice as many resources as MSO and is twice as slow to begin with anyway.
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if you know what I mean. 
!!
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