There's a technique known as 'Tempered Tuning' which uses specific harmonics for tuning each string. It seems complicated at first but, once mastered, it's quick and easy and more accurate than the old 'Bottom E fifth fret = open A, A fifth fret = open D etc, etc.' I use it all the time now and it gives the 'best average' tuning which causes the least disturbance as you play in different positions around the F/B.

It was the subject of a thread on Mudcat a year or so ago but I'm damned if I can remember who started it.

It goes something like this (and I'm at work just now so I don't have my guitar handy to check myself):-

As a datum, tune the 6th string by whatever means you have (electronic tuner, pitch pipes, piano, tuning fork, guesswork, - doesn't matter unless you want to play alongside an instrument which has fixed pitch, like a piano or accordion). From there:-
Tune open 1st string to 5th fret harmonic on the 6th string.
Tune 4th string fret 2 to 12th fret harmonic on the 6th string.
Tune 2nd string fret 3 to 12th fret harmonic on the 4th string.
Tune 3rd string fret 7 to 12th fret harmonic on the 4th string.
Then tune the 5th string (12th fret harmonic) to the 3rd string fretted at 2.

Might not be dead right but I'll check it at home tonight and correct it tomorrow if necessary (unless some other smart-arse like me puts it right first!).

ENJOY!
Johnny