Perhaps hypocritically, I'm not a huge fan of blogs. There are several that I enjoy, but too many are poorly written and banal.
If you're suffering from holiday-induced delirium, though, treat yourself to a jolt of wicked good humor from Darci Ratliff and Heather Havrilesky. You'll laugh so hard you'll shoot egg nog through your nose:
Darci Ratliff's Kittenpants
kittenpants: the site for cats, pants, Keith Gordon
Heather Havrilesky's Rabbit Blog