the first dreamcast emulator for windows to run commercial games has just been released
http://www.chanka.org/
havent tested it yet and doubt i will for a while cus i cannot be bothered to install directx 9 (plus u cant beat the real thing) but thought some of you lot would like to try it out
i believe you will need the dc bios and also the vmu bios but no asking where to get them please