This might be a tall order to fill, but my goal is to find one new blog per week written by a grower or industry personality.
This week, it's the Transatlantic Plantsman. Lots of nice information on varieties. There's also a nice section here on how to keep track of all the blogs you want to read.
Do you have a blog? You can see your site here. Let me know about it. Leave me a comment or e-mail me at firstname.lastname@example.org.