What are some good Tumblr blogs?

So with Tumblr in the spotlight, I thought I'd login to my account again. And I'm, as usual, plauged with hundreds of weird reblogs.

So what are some good Tumblr blogs to follow? Geeky, techy, design-y (more software-design or hardware-design than general design) blogs would be nice, but I just don't know any with good original content or at least great reblogs.

There are obviously those niche blogs (like pictures of dogs, Mrs June) but what are some that aren't ironic, but actually good.