チュートリアル
システム一般
Workspace
How to configure panels in KDE SC 4.1.2 (Link to kde forum entry) Equally applicable to later versions. 
Tweaking Plasma 
Using with small screens (eg. Netbooks) Discusses several issues where screen space is at a premium Kimpanel Build a plasmoid for controlling input methods
File Management
Discover Dolphin 
File System Navigation 
Archive Management in Dolphin 
Transfer files from and to a server using ftp, sftp, webdav and the like
In Kontact
In KRunner
KRunner is an amazingly useful utility, launched either by Alt + F2, or by a right-click on the desktop, and selecting 'Run Command'. Now learn some of its uses Using KRunner as a calculator Using KRunner as an application launcher Running BASH commands in KRunner Navigating through options Using the Unit conversion plugin
In KOffice
Basic Layout is a tutorial that creates a leaflet with various images and explaining text using KWord's frames technology. Several text frames and image frames will be created and positioned on the page. A Second Layout experiments with placing, grouping and moving images within a text area. A third Layout builds a page for a photo album. 
Using the Artistic Text Shape is a tutorial that shows how to get started with the artistic text shape that all KOffice applications provide. KWord Manual Tutorial on basic concepts of working in a frame-based environment, and detailed guides for all your WP needs.
