OpenOffice.org and Microsoft Office XP and before look a lot more similar than Office 2007 and OpenOffice.org. If you're used to any of the previous Microsoft Office versions, you're going to think Office 2007 looks VERY different. I can't judge which is more intuitive, except that technically, there's no such thing as intuitive software since none of us is born with a biological imperative to print spreadsheets. I think people like what they're used to.
These are some screenshots of MS Office 2007; certainly not the only ones.
This was first published in May 2007