I tried a PAL A1200 on my Panasonic 42" PAL/NTSC plasma with mixed results. The AV connection produced an unstable black and white image. I then tried my NTSC scan doubler equipped A1200T and got mixed results - some screenmodes worked perfectly, while some lower res ones needed for games just clapped out.
When I have more time then I'll probably experiment again, but meanwhile I have a P2.8 PC attached to the TV (via the monitor port) with a wireless keyboard and mouse and an old A1200 keyboard attached via the USB port using the Keyrah so that I can use WinUAE.
MAME works good too. There's nothing like playing Amiga Lemmings or the arcade classic Pheonix on a 42" plasma! Of course, the wife has other ideas...