If you own a Honeycomb tablet, then you probably know that a true fullscreen option doesn't exist. When watching YouTube videos, viewing images in the gallery, or playing a games, the navigation bar is always present - which causes frustration for a lot of users. Enter HoneyBar, a simple way to temporarily hide the navbar on rooted tablets.
Upon install, HoneyBar will launch itself and constantly run in the middle of the navbar, which is usually blank space. I say 'usually' because with TouchWiz on the Samsung Galaxy Tab 10.1, this is where the mini app tray is. The developer is aware of this issue, though, and implemented an experimental fix that offesets the location of the HoneyBar touch zone.
If you're not running TouchWiz, though, you can tap the white box at any time to hide the navigation bar. After the first ten uses, the white box will hide itself permanently, since the user should be used to how HoneyBar works at that point. The show the navbar again, just tap the center of the navigation bar.
HoneyBar will set you back $0.99, and you can grab it by hitting the widget below.