Arghhh...keep well away from any conditioner! It will coat your nappies and ruin the absorbancy - it takes about 10 washes tp get the absorbancy back up in some nappies.
If you have the option of a tumble drier a good tip is to line dry until they are almost dry then bung them in the tumble drier for 10 mins or so to soften them up. That won't affect the lifespan of your nappies.
Rubbing them together when dry also helps a bit.
If you have a washer/drier don't use liquitab things - you'll end up with very smelly nappies.