I like the Gestalten site, not strictly a design blog but then perhaps that is a good thing...

http://www.septemberindustry.co.uk/
http://www.aisleone.net/
http://swisslegacy.com/
http://www.thinkingform.com/
http://beautifulanduseful.tumblr.com/

to name a few!

Thank you Karl and Nathaniel

If anyone has anymore you can keep posting! Thank you in advance :-)

Smashing Magazine:

http://www.smashingmagazine.com/

http://designobserver.com/

http://www.underconsideration.com/speakup/ (archived)
http://luc.devroye.org/blog.html (Luc's enormous list of blogs)
http://www.typography.com/ask/?path=head
http://fontfeed.com/
http://typographica.org/
http://www.typotheque.com/articles

http://www.computerarts.co.uk/
http://www.underconsideration.com/fpo/ (my favourite)
http://flyergoodness.blogspot.co.uk/
http://swisslegacy.com/ (already mentioned but good)