The Activity Mom is great and The Crafty Crow has all sorts of links to different craft sites for kids.

Not time for flash cards is one of my faves - I have included a link to "Letter of the Week" activities - great for developing literacy skills.

Not Just Cute does do things other than craft, but the craft stuff is excellent and cheap.

This is a kindergarten blog with some great ideas.

This link gives great ideas for "Reject Shop" style crafts and Pre-kinders is more educational than crafty but still worth a look.