I wanted to control my Roku device using PC especially when I want to search YouTube or Amazon videos. Typing letter-by-letter using Roku remote with arrows is too primitive interface. There were some neat apps available on iPod tpuch, iPhone, and iPad. But I wanted something on my PC.
I found this neat app that I liked. You need to enter the IP address of the Roku device to start using it. The IP address can be found by clicking the Home button and going to settings and player info.