Depends on what you want mate.

Front End toe in will increase straight line stability, but slow down turn in. Toe out will speed up turn in, but straight line will be more unstable, or as most people feel it on cars with bigger wheels, "tramlining" in lorry grooves / over bumps etc.

Rear end toe affects the oversteer/understeer charicteristics.
The more toe in you have the more stable the car is, and the more it will understeer. Toe out promotes oversteer.

Look how badly standard Cosworths snap-oversteer, this is because over the rear suspension travel, the wheels go from 1 mm toe IN to over 3mm Toe out!!!

The ahmed/Danny B beams reduce this to under 1MM over the range of travel IIRC.

Mike I seem to remember likes the car to understeer very slightly on the limit, then tuck the nose in on lifting off the throttle, so his settings will reflect that.

I Like oversteer, so set my car up very slightly more agressivly at the rear.

Obviously, the settings I have written down are a base setting, so depending on your driving style, you can alter them to suit yourself.