I've been using the 2005FPW with my powerbook for several months now, and it works as an amazing second monitor, same dpi as the powerbook so the transition is seamless (only with the older powerbooks, newer powerbooks have higher dpi) Oh, and the powerbook lid handily covers the dell logo, but I don't really mind Dell.
I received it 2 days before the scheduled date, which was quite amazing in my book. Kudos to Dell for shipping it quickly. It was only "in production" for me for several hours.
I don't know what to say about portrait mode besides NVIDIA getting their butts into gear and making a rotation driver for macs =/ It would have come in handy many many times now.
As for the multiple inputs, it works wonders as I have my PC connected via VGA, and I'm looking for HDTV solutions to connect via component, so I can watch TV as well. Such a big plus over the ACDs.
-OA