Here are a few of my favorite tutorials:
Basic Sewing Skills:
Els' Sewing Invisible Zipper - I can consistently install invisible zippers using this technique.
Els' Facing for Invisible Zipper - To make things "on the inside" look extra lovely.
Sweet Techniques:
Slapdash Sewist's Bodice Construction - For simple, self-faced bodices on dresses. Elegant and Easy!
Small Projects:
NanaCompany's Needlebook Tutorial - Easy, cute needlebooks that can be as involved - or not! - as you want them to be!