I've found my A4 acetate sheets and tried this trick from that Crafty Cheats freebie magazine thingy and it works!! Like magic! I couldn't believe it.
Create your transfer in something like Word, Publisher, Powerpoint, Photoshop etc.
Put an acetate sheet in your printer and print your transfer - use BEST quality and remember to choose MIRROR IMAGE if it's important for your design to be the right way round.
Let it dry a bit (although I didn't bother and it still worked) and do NOT touch the print because it will come off.
Put the sheet ink side down on your card/whatever and rub the back with a lolly stick (or anything similar really) and remove the acetate. Voila!
You can then rub the acetate clean and use it again.