While other developers offer this type of product, SK Tools is the Swiss Army Knife of touch screen device tool kits. It is an excellent set of utilities that performs cleaning the registry and file system; freeing up RAM; cleaning out cache folders, e-mail attachments, duplicate files, shortcuts, bad uninstall info; and much more. It can do 70 different system tweaks in 10 categories, and can even monitor your CPU performance. In particular, the reviewer appreciates that it can scrub duplicate contacts and past appointments. One of the most important things SK Tools has is its backup and restore function, which could save you a lot of grief, in case a system crash happens. Overall, SK Tools is the single most important investment you can make for your treasured handheld device.