These are places on the web that I have found helpful. For the most part, these are not blogs and regular web sites, but more like the Reference section in a library.
For a list of downloadable docs, click here.
The Hoss Tools Two Minute Tips series is a great collection of gardening tips. They are in Georgia, so it has a Southern slant. I have a number of tools from Hoss Tools, and they are top quality all the way.
Daylight Hours – U.S. Naval Observatory page where you can enter your location and get a chart showing the hours and minutes of daylight on each day of the year.