I really enjoy reading Knitting in Transit, written by a knitting mom. The Lumpy Sweater isn't written by a mom--the author is a teenager--but it's fun to read and has some great knitting info. If you're a knitter, crocheter, spinner, or dyer and haven't checked out Ravelry yet, you really need to! :-) The Knit Witch, in addition to the items she has for sale, has a blog and some great free knitting and crochet videos.
I have a website called the Craft Playground, www.craftplayground.com, focused on arts & crafts with kids. In addition to project ideas, you'll find throughts on how to talk with kids about their art ("What is it?" might not be the best question to ask of your 5-year-old artist, but "Tell me about it..." might get you some good answers.), connections to famous artists, and other tips. I also included ideas for displaying and archiving kids artwork, based on a survey of moms I know.