In no particular order:

Createmake
FFFFOUND!
FormFiftyFive
It’s Nice That
The Serif
Manystuff
Computerlove™

I have more, but those aren’t in my RSS-reader at the moment, so I can’t find them right now. Also, a lot of the posts on many of these blogs have ’via:...’ beneath them, check those links to find yet more blogs. ;)

Design Observer

http://www.underconsideration.com/brandnew/

oooh, this is great, thanks people. And when I say ’great’ I mean really dangerous for my productivity ;)

Adgoodness

http://www.manystuff.org/ is THE place to follow.
http://vvork.com/ is also interesting, but the focus is more on contemporary art with the occasional graphic design pieces.

http://www.monoscope.com/
...is my new favorite.

These are really great, thanks again, it’s really valuable to have personal recommendations of sites that are interesting and helpful, it’s hard to know when you visit a site once to know whether it will consistently deliver

—> I’m aiming to finish some logo concepts today so these will be waiting at the end as a kind of reward, until then I’m holding off, although I had a quick naughty look.

Bit of a tangent but kind of related, now that design blogs are so readily available do you find you’re buying or subscribing to less design mags?

I hardly ever bought a design mag anyway. Also no subscriptions to one.
But I do read design blogs for years now. :)

http://branding-design.blogspot.com/

Not many pretty pictures but if you’re a designer who likes to read, there’s some good articles that will make you laugh.