The tags help with finding their posts on various rules, editing mistakes and news in journalism. I personally think that they did a good job tagging their most popular and helpful subjects.
They also have their posts organized into categories, which makes it a little easier to find a post if you're looking for a broader topic than one of the tags may cover.
Grammargeddon is a grammar blog that offers some interesting and funny ways to remember difficult grammar rules. It also finds funny grammar mistakes in newspapers, ads and comics.