those are all really great resources. i’d also mention pg’s personal site (http://paulgraham.com) as well. it’s not really a blog, but his essay’s provide a level of depth that’s often lacking from many of the more active blogs

and steve blank’s site (mentioned above) also has an incredibly long and comprehensive list of resources for new entrepreneurs including many other blogs worth checking-out as well

i’ll also throw out one more, "Bloomberg Businessweek: The New Entrepreneur" (http://www.businessweek.com/blogs/the-new-entrepreneur) it’s (obviously, given the name) a news blog, but i find they cover a lot of interesting topics less frequently touched-on by the major business/tech sites out there