The hat that I just posted was the first non-lace thing I've done in a long while. It was knit in the round and done completely in stockinette. My tension is awful! Up close the hat looks like it has ridges - some rows very loose...others very tight. Hmmm....I may need to go back to the basics for a while.
As an aside - for others who have trouble with tension - do lace! You can't tell - it's sorta' like felting your work no one will know (and it's still just knit and purl).