The Mathematical Association of America (MAA) is currently running a free trial of MAA Reviews, its excellent source for reviews of recent mathematics books. Eight new book reviews are posted each week, and there are currently over 3,000 reviews. You can also search for books that have been recommended on the Basic Library List. Next time you want a recommendation for a good introductory book on abstract algebra or differential equations, give the Basic Library List a try. The 1991 Basic Library List is always freely available.