Some of my favorite sites for sewing/crafty/local arts stuff:

Burda Style Open Source Sewing
Craft Magazine
Greater Bay Area Costumers Guild
Rock! Paper! Scissors! Collective
Waterside Workshops

Online Costume suppliers--I know all of these folks & their shops can seriously get me into trouble!

...Out of a Portrait...(hat patterns!)
Lost Coast Historical Patterns
Renaissance Fabrics
Sacramento City Dry Goods/Laughing Moon Patterns