I recently read a great article by Sam Stephenson of 37signals where he shows some of the difficulties Microsoft creates for developers (and all users). He’s recorded 2 screencasts that perfectly portray what it’s like working on Windows versus working on a Mac. Check out his installation of a script debugger on Windows Visa and then on Mac OS X. I showed both of these to my family to, once again, explain that it’s not their fault - users are not stupid but most software is.
David Heinemeier Hansson really says it well in the Apple video promo that he and Jason Fried star in. They talk about the joys of owning a Mac and how it’s changed the way they work. Having a Mac definitely makes my development work more pleasant.
On a final note, I have to send a big congrats to my brother who is, as of today, the newest convert to the developer community (and I’m jealous that he has a MacBook Pro and I’m still on my PowerBook). You can see how much brighter the screen is on the new models.