The new mantra of marketing is ‘be useful’ (to your customer). My friend Viki Collier has been very useful by introducing me to a useful book:

Common Errors in English Usage is a fun book with a great web site. Where else are you going to learn:

The center of a wheel is its axle. An axel is a tricky jump in figure skating named after Axel Paulsen.

There’s a real time sink hole here. But at only $15, this book is a great value. Support the author Paul Brians and buy it here.