Unreal4Ever has posted a mod for the Unreal Tournament Demo called U4E, which adds a bunch of new and refined weapons to the demo. They have also posted another couple of mutators for the UT Demo to accompany the mod, U4E Arena, which lets you play UT with only U4E weapons, and U4E Random Arena, which lets you play with a random collection of all of the weapons in both UT and U4E.