It does of course come as no surprise, but the mobile phones like N80 is a small computer. Not a phone with a camera, or a camera-phone with Java-support, but a full-fledged computer, albeit with a somewhat small screen and keyboard.

So what's more natural than having a file explorer and task manager installed?

Y_Browser is a file manager for Symbian S60.

While Tasky is "yet another task manager for the Symbian OS".