In addition to those above, I check this one out every Thursday:
http://www.rose-kim.com/rose-kimknits/
I love Wendy Bernard's Knit and Tonic:
http://knitandtonic.typepad.com/knitandtonic/
TECHKnitting has some great info:
http://techknitting.blogspot.com/
And this one has quite a few free patterns:
http://smariek.blogspot.com/