I'm collecting this here today in part to have one list for the facebook page I manage, and for those of you who read here I wanted to toss together a bunch of links to some of my favourite costume/sewing blogs.
The Laced Angel
Diary of a Mantua Maker
Before the Automobile
The Costumer's Closet
Sewing Technique Blogs
By Gum By Golly
Gertie's Blog for Better Sewing
Bits and Bobs:
The Sewing Academy
NineteenTeen - great resources for the oddments of 19th century life from literature to customs, to carpets mentioned in novels!
Glamor Daze - historical makeup tutorials
The Enchanted Serenity of Period Films
Queens of Vintage - Vintage bits, more rockabilly and current vintage trends.