This is great. Sun are advertising OpenOffice in and on buses that serve Redmond (the home of Microsoft for those who don't know) with quotes like the one above and "Stop giving a bully your lunch money". You can see more of the pictures here or even buy a T-shift for yourself.
Whilst not the most imaginative ad campaign, it certainly is getting people blogging about it (me too) and as a result can only have a knock on effect in the uptake of OpenOffice.
So go on, try something different. Download and use OpenOffice for a month and see if you can live without MS Office. I've been MS Office free for about 5 years already and best of all, it's the same program on my Solaris, Ubuntu and Mac machines for no cost at all.