I'm a switch...
Oh, you mean from PCs to Macs. Nevermind.
I've bounced inbetween the two for the past several years, depending on what I could afford and what best met my needs, I'm currently using a home built PC and have no desire to buy another Mac again for the time being, mostly because I use it as a Media Centre (with the appropriate OS to go with it) and Windows is far better at that than Macs are at the moment. I'm afraid if I bought a Mac now, I'd be booting Windows on it most of the time. 😱
I'm waiting until I hear more about Leopard an its rumoured built-in virtulisation before I spring on another one. I'm intending to get a MBP, but not unless I can quickly switch between operating systems, or if there's a robust and polished media centre app on OS X that can handle a wide variety of formats including and especially VIDEO_TS folders which I don't think any of the four currently out there (MediaCetral, Front Row, Centrestage, iTheatre) handle very well.