Basic double crochet Circle Chart - hat sizing info too
Simple crochet circle pattern for single crochet in the round: How to Crochet a Flat Circle Using Other Stitches
Crochet conversion charts to help you to work out the right crochet hook sizes, yarn weight and terminology. Making understanding crochet patterns easy.
Seamless+Symmetrical (Invisible Join) By Sarah London
20 Amazing Free Crochet Patterns That Any Beginner Can Make---Crochet Circle Bookmark Free Pattern and Tutorial. by nola
cascadiacrochet: This awesome person made a chart for number of stitches for increasing for crocheting in the round. I love you awesome person. (source) Very helpful! Crochet in Round!
Simple, round crochet coasters - easy transition into doing other patterns