Here's a program that will measure an analog value (currently set up as measuring resistance) that can measure an extremely wide range of resistances from around 300ohms to 2.2meg ohms tested so far. Expect about +-4% accuracy (usually 4% too high on resistance). With my setup the measurements were …

Using Digital I/O as analog input (working!)

simon.monk February 3, 2011, 4:52pm 2

A good example of lateral thinking.

Could come in handy some day.