Ive noticed the topic of wheel offset comes up lots, so, here are some links and detals for peoles to look at whom have questions regarding offsets.
Basic overview:
The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. The offset can be one of three types.
Zero Offset
The hub mounting surface is even with the centerline of the wheel.
Positive
The hub mounting surface is toward the front or wheel side of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars.
Negative
The hub mounting surface is toward the back or brake side of the wheels centerline. "Deep dish" wheels are typically a negative offset.
If the offset of the wheel is not correct for the car, the handling can be adversely affected. When the width of the wheel changes, the offset also changes numerically. If the offset were to stay the same while you added width, the additional width would be split evenly between the inside and outside. For most cars, this won't work correctly. We have test fitted thousands of different vehicles for proper fitment. Our extensive database allows our sales staff to offer you the perfect fit for your vehicle.(tirerack.com)
Measuring your offset:
Link showing how to measure your offset etc.
http://www.rsracing.com/tech-wheel.html
Wheel offset calculator:
Good link to look at when changing wheels, seeing what effect offset will have on the position on the wheel on the car clearance wise etc.
http://www.1010tires.com/WheelOffsetCalculator.asp