I would like to share my latest achievement. I've upgraded my Pi 1536 with a new LCD with a resolution of 1920x1200 pixels!!! And it was quite cheap. The only thing what you need to buy additionally is a cable which connects motherboard, inverter and display. Originally the 30-pin cable doesn't use all 30 pins and half of them are empty (no wire!). I bought such a cable from Xi1526 model (17"), but I think that such connector from Xi1546 / Xi1547 might fit. I connected the cable to the motherboard and to the inverter, later to the LCD. I bought Samsung LCD because I think it's the best one. It's working amazing with my HD3650
It's running perfectly on: Win XP, Win Vista, Win 7.
Total cost: about 100 euro