Women 2.0 helps bring more visibility to women doing awesome stuff in tech and also offers a lot of great programs and content for learning to code or start a company. Their blog posts are usually from entrepreneurs and they syndicate a lot of lesser known blogs.
Always getting the conversation going, Marco is fun to follow along with as an entrepreneur and as a writer. Also, check out The Magazine - his iOS Newsstand publication http://www.marco.org/2012/10/11/the-magazine
Venture Hacks is less a blog and more a resource, since it isn't updated as regularly anymore. It is brought to you by Nivi and Naval, the same two fellows who created AngelList, and is full of help advice for raising money as a startup founder.
James Altucher will make you think and make you laugh, and what more can you ask from a blogger really? His broad range of experiences - both in business and the emotional rollercoaster of life make him a refreshingly real and sometimes contrarian voice.
Bessemer Venture Partners recently started blogging (check out the updated website too!), and my friend Ethan's post "Developer-Focused Businesses Are Where It’s At" is my favorite so far. This is in my one to watch list, we'll see how it goes as a new blog is always tough, but I'm excited to see what's next.
Started in 1997, and probably one of the longest running blogs I've followed by one of the most dedicated bloggers. Find some posts annoying, but the other half are good enough that it is worth it to keep reading. He loves the idea of reinventing press, so I feel like Referly is right up his alley for magazines. Has made many many contributions to the web as we know it today.
TechStars founder David Cohen is an ex-hacker VC, which always endears him to me a little extra. His blog is quite good, covering a broad range of topics and giving a heathy non-Valley viewpoint I find refreshing.
Eric is most well known for "The Lean Startup" but he was blogging long before that, and his articles go back to 2008. As a former entrepreneur turned full-time author and advisor to companies he has seen a lot. Check out his definition of "Minimum Viable Product"
Another blogger who has written a huge body of older work plus books. Doesn't blog as frequently anymore (he is publishing books, speaking at conferences etc.) but "The Art of Bootstrapping" post is awesome and his book "Rules for Revolutionaries" is a must read.
Over 1,000 articles written about software and the Internet - so this is one where you probably want to dig around in the archives and not wait for new posts (I mean, he is retired from blogging after all).
Father of the lean startup movement, but more importantly a really thoughtful guy who loves entrepreneurship and teaching. Read his books but also read his older stuff, particularly "The Secret History of Silicon Valley" http://steveblank.com/secret-history/
Entrepreneur turned VC, it was recently announced that Chris will be moving to the Bay Area from New York to join Andreessen Horowitz as a partner. He has no problem being controversial, saying what everyone else is thinking, and his posts are consistently thought provoking.
Fred Wilson is a very successful VC, but he has been an interesting blogger for even longer than that. Covers a broad range of topics for entrepreneurs, and also shares interesting opinion and insights around his own investments.
Some to the best stuff happens in the comments, and he is very accessible.
Patrick McKenzie is an entrepreneur who writes well and is inspiring to follow along with. His company is BingoCardCreator.com and he is the leading thinking on Micro ISV businesses. I was lucky enough to get to know him through the Twilio developer community, and I think he is one of the rare people who can make marketing palatable to developers.
Paul Graham's essays are great because they will make you think, and you will find yourself coming back to re-read them and learning new things as your own context changes. I particularly like "Frighteningly Ambitious Startup Ideas" and "How Not to Die".
Ben Horowitz's essays are right up there with PG's. As a first time CEO I find the topics he chooses are highly relevant to problems I am trying to solve. I also love that he opens each post with a quote and hip hop track.
David Hornik of August Capital is funny, google "Shit VCs Say" to see the video he made. His most recent "The Temptation of Data" digs into how our more sophisticated data collection for startups is changing the conversation in the board room: http://www.ventureblog.com/2012/09/the-temptation-of-data.html
Svbtle is a curated list of blogs. You can subscribe to the master RSS feed and constantly discover new interesting writers who you might not have been following before. So worth it. And if you writer, I hope you will apply.
As far as learning about marketing goes, Seth is your guy. If you read for super-tactical tips you might not like him, but if you're trying to think different and act differently in the crowded online marketing space then this is a must read.
First VC blog I ever subscribed too, still great just like First Round. Josh talks about all sorts of things, and also makes the VC world feel very accessible (see: "Company Math vs VC Math" for an example)