Take Control books is holding a half-price sale across all its helpful PDF Mac and iPod help guides until May 8.

Available Mac titles include: Take Control of Maintaining Your Mac, Take Control of Mac OS X Backups, and Take Control of Permissions in Mac OS X.

Other titles offer advice for making music with GarageBand, podcasting, networking and iWeb.

The sale works using a special coupon code, which will appear on the upper right of the first screen of the shopping cart.