I just purchased the Logitech DiNovo combo keyboard, media pad, and MX900 setup today. The MX900 and Keyboard connected to my Powerbook 15" AL (OS X Panther) easily via Bluetooth wireless. It is even labeled "Logitech MX 900 Mouse" and "Logitech DiNovo keyboard" in the Bluetooth preference.
I originally purchased the MX900 mouse seperately and it had a silverfinish to it, whereas the the MX900 that came with the DiNovo setup has a blue tint to it. Both work the same, no noticeable lag; quite accurate but still requires Logitech driver/software to utilize all its features.
The included media pad has an LCD display with a numeric pad. Its suppose to notify you of incoming instant message and E-mail according to Logitech. Unfortunately, I can't get it to connect. I tried setting up the Bluetooth preference to locate "other device" but nothing was found. This needs the Logitech software. I'm going to hook it up to my PC shortly.
The DiNovo keyboard is excellent! It is responsive and comfortable - the keys feel great. It is very lightweight and thin. The volume keys work with OS X. Key functions such as media, mail, sleep, etc. don't work unfortunately. Overeall, I'm satisfied with the purchase! Lets just hope Logitech will release some software/driver soon!