I've never really searched for blogs on learning Russian, but I sometimes check my spelling and grammar online (which can be risky since Russian-language websites aren't necessarily flawless!).
A recent grammar check led me to the website of Josefina, a Swedish (?) woman who has put together a fantastic site. She shows great insight into Russian culture and language, delving into the uses of various colloquialisms. Her Russian isn't 100% flawless, but there are some native speakers who leave minor corrections in the comments area. She writes well and her posts are entertaining. I haven't explored much yet, but you might find it interesting. It helps to know a little Russian to get the full use out of the grammar points, but it is all in English and not all of the posts are grammar-based. http://www.transparent.com/russian/