Ask Olive Tree Genealogy by Lorine McGinnis Schulze is one of my favorite genealogy blogs. It's one of the few genealogy blogs that's marked with my "0 -Must Read" tag in Google Reader. (That zero at the start makes this tag the first one listed in my list of subscriptions.)
I love reading Lorine's case studies. It's like following a good murder mystery, And that's coming from someone who has read all 60+ novels and 150+ short stories by Agatha Christie. The only thing I like better than reading how other people tackle research questions is tackling them myself, when I get to play detective.
And my research is made much more fruitful by the information I glean from reading blogs like Lorine's.