Here's a neat trick for everyone who wants to learn how to watch YouTube videos on the go while your PSP is connected to the internet via WiFi. Download and install PSP Tube and you're ready to go. The steps are fast and easy and it's in video format so you can follow the instructions in the tutorial without hassle. Go ahead and try it yourself at How To Watch YouTube on PSP.
Many thanks to Don for this awesome YouTube and PSP tip.