Or if you prefer the UK edition, Business Traveller also have a section offering slightly more detailed city guides with helpful maps included.
4-Hour Guides
Here's a great idea - Business Traveler (US version) have put together a number of online travel guides for a range of popular business destinations worldwide. These provide an overview of the area, with specific places to visit and directions to get there. Especially geared toward the business traveller or anyone with a little time to spare and a new place to explore outside their hotel door...