This is a website by a guy called Marty Swartz. He is brilliant at teaching guitar.
He is a blues player so for me as my two main interests are blues and metal it was a good place to start. Even if you are not into blues I would recommend it. he teaches the basics (and really advanced) so well. different styles will make you a better player anyway.
He really starts at the absolute basics and work from there - name of each string, open chords, scales, intervals (he explains these in a great way), bar chords, strumming patterns, etc etc etc.
This may sound like something a basic but with strumming he starts you on one down stroke on each beat, then adding an up strock inbetween and then adding in various patterns as you progress. It really really works and develops the basic building blocks before moving on.
He teaches chords so you start with the easiest and move on, also so the chords you have just sussed help to get the fingering right for the next ones you will learn.
There are lots of different sections to work through so you can work on chords one day, strumming next, scales, picking etc etc.
I cannot recommend it enough. I started this a few weeks back and love it. You can sign up for a 3 day trial and then sign up if you want. If you don't like it, you can get your money back no questions asked.
I have also bought membership for Lick Library (the metal side). this is full of soo much stuff it's amazing. Not just metal either. www.licklibrary.com
I use LL for all things like alternate picking, riffs, licks etc. There is a lot on this site!
I combine my time between the two sites and this seems to work well.
One thing worth doing as someone on here said is getting a metronome. Learn to play a scale, lick etc, then practice what you have just learnt with the metronome. This really really helps perfect what you are learning and play in time.
In case you don't do it. Learn to tap your foot as you play, this really helps perfect timing also. This is where the basic one strum on each beat is good place for this, then the upstrum comes on the top of the foot movement.