here's another way to tune your guitar, but it isnt all that effective, but useful if you are in a hurry and dont have a tuner.
first of all tune the small e string as close to perfect as you can, then press down on the 5th fret second string and match the pitches of the first string and second string, and then ONLY to tune the third string, press down on the 4th fret third string and do the same thing as you did to tune the second string, and then keep doing that with the rest of the strings only pressing down on the 5th fret on each string...
sorry if this is kinda confusing.
oh and one last thing, if you are going to play in a band, try to avoid using this method, but it is fine to use if you are just going to play by yourself..
Hope this helps
but seriously... get a tuner, it will help a whole lot better.. i have the Korg GA-30 guitar/bass tuner.. it costs $15- $20