Let's see, 11 months into blogging and I realize this: the time to think about what to blog is inversely proportional to the time and energy necessary to running a design firm.
That is, the busier I am with design-related issues, the harder it is to be able to write about them. Too busy doing and not enough time being. Time only to observe and not to reflect.
At that point, Digg becomes a valuable tool for additional observing. (Thanks to Guy Kawasaki). Neil Patel of Pronet Advertising has an excellent overview of Digg, so it can become useful quicker to busy designers.
Anyway, blogging about blogging is boring. You can also read about what other designers who blog write about on Designers Who Blog.
Back to the mines, so to speak. More deadlines to meet.