Must Read Post on Entrepreneurship As usual, I’m a little late to the party, but let me echo Fred’s and Brad’s sentiments and endorse Marc Andreesen’s new blog. If you’re an entrepreneur or like thinking big entrepreneurial thoughts, this is a gooe blog to add to your blogroll. My only critique is that some of his postings are really long — but they’re worth it. His most recent post, which finally prompted me to post this, is a list of reasons why NOT to do a startup (it also includes a good list of reasons TO do a startup). Just a snippet to pique your interest, but you have to click through to see all of it — the richness…