There's a better way. And I think the marketing types at Apple should pester some of their techies to make it happen.
I want to install a new program on my work computer (running WinXP Pro) that will track every program I run for two weeks or so. At the end of that period it should report to me how much of what I ran is available under Mac OS X.
I've written more details on this, but some key points are that it can show alternatives even if the same program exists (e.g. Office), it must be open source, it must be honest about the mac capabilities (e.g. "program X will work for most users, but may not be compatible with a corporate server environment because of blah blah").
Of course, this might work to convince people to switch to a linux desktop as well, but the linux desktop has bigger issues to cover than just application compatibility.