Oh man, everybody's got their own set of favorites. You just have to find the ones that are appealing to you.
Almost all of them point to other sites to check out. That
USS Clueless appeals to me because the guy is an engineer, and he approaches a lot of things from an engineering standpoint.
For sheer volume it's
Instapundit.
The best writer by far is
Lileks, once a day M-F.
Vodkapundit has an appealing voice and is generally sensible.
Winds of Change takes on an awful lot with multiple writers.
But everyone will find their own that is appealing.