Judy Harper - one of my favorite designers and guru of all things basketweave-stitched - recently posted an awesome tutorial for properly working the basketweave stitch, a member of the tent stitch family.
You can see more on her Possibilities, Etc! blog site.
She also has a terrific tutorial for working Basketweave Stitch along a curved edge.
These tutorials are perfect for beginners, and are also terrific refreshers for the experienced stitcher!