Full-screen Web as a title says let you browse the Internet using the whole size of your iPhone/iPod Touch screen - 320x480px.
If you are tired of using Safari with a lot of toolbars try using Full-screen Web.
You get a standard functions as a web browser usually gives you - go to previous/next page, reload. The app works quickly and fine without any unexpected crashes.
Enter an url or keywords and search in google. Press "x" button to hide the controls, shake your device to show it again.
The app works in both landscape and portrait mode.
Full-screen Web remembers the last page visited so you can quit and reopen the app without any fear of losing your data.