i tried a transparency on my injet on the last board i did, it worked amazingly well, nice and dark, with nice edges and all... my printer doesnt have rollers after the printing head, so i dont have to worry about it smudging, i just have to let it dry for 10 minutes after..
unfortunately, with the last board, my overhead got scratched and the board came out bad...

i think what i may try, is getting a laser printer, adn try ironing the toner onto regular (not-presensitized) boards. that way, i can use cheaper boards, and skip some of the chemicals..