Rute (Rute Users Tutorial and Exposition) is a book on GNU/Linux that aims to be the definitive guide for new users as well as sufficing as training course material, covering both the RHCE and LPI requirements. It covers essential theory to UNIX as well as giving practical tutorials on all fundamental aspects of Unix administration, from basic commands, the theory of TCP/IP, the Linux filesystem, through to configuration of mail, DNS, and other servers, through hardware configuration and package management. It is not Unix-specific but tends to give examples suited to Debian and RedHat-like systems. Rute comes in HTML and PDF formats.
The Rad Inks Card Designer is an applet suited for print industry Web sites. It provides your users a simple means of conveying ideas for their business cards to you. Users can specify fonts, colors, and even add images to their cards. The final design is saved as an XML from which you can regenerate the design.