I don't know if Mark is even still doing this, but it's his idea, so blame him. I'm not even here right now. Some blogs:
Jackfruity - cool stuff about technology, social media, journalism, and Uganda. Now there's something you don't write every day.
Mohamed Nanabhay's Blog - OK, so the title isn't all that original and he doesn't update very frequently but this dude is SMART.
Burning Bridge - from another outstanding global citizen, Ivan Sigal.
and a "green pick of the week" for the ecomonday crowd: Ecopolitology.
I'm sick of coldplay a capella, so here's something actually smart and useful: