cuadros de crochet
this blog entry has five ways to join granny squares- I can't wait to try them!
Flat Braid 3-Ch Crochet Join Tutorial pattern by Margaret MacInnis. I've used this technique 3 times now, its my 'go to' join now because its easy and is great looking.
How to Join Crochet Squares - Completely Flat Zipper Method
A new (for me) way to join squares: tight join - tutorial
Free crochet pattern square coasters usa
A variation on the traditional granny square motif.