everyAir is a great app for remotely control your computer, regardless of operating system, from your iDevice. It costs five dollars on the App Store and you can download their computer client on any number of home computers. It has many options for navigating your computer, including a mouse drag mode and an on-screen-keyboard.
ProcessRenicer is a freeware program that lets you adjust the priority of different programs. If you have one program, say a video encoder like handbrake, and it is taking up to much processor power. You can lower the priority so it will allocate less space, while this will make it take longer you will also be able to do other things more effectively in the background.