The new Mini DisplayPort adapters are insanely expensive. Since I need one for my external monitor as well as presenting on a projector, I dropped a total of $60 on the DVI and VGA adapters. Even worse for those who have to power their 30" screens with $100 adapters. :/
At the office we have some new MBPs and old ADC Cinema Displays, so you need a $30 DisplayPort to DVI cable and a $100 DVI to ADC converter. What a pain.
