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In a singleplayer world showing off the modcount and the current fps (which updates in realtime (with a 1 second delay))
Titlebar changed simply to a different text without any special formatting
Ingame showing off the username display and showing the server address
The config menu! including a button to disable the mod entirely and the nice wall of text to remind you what things you can do so you don't have to come back to the modpage

Heavily configurable mod to customize the minecraft window title!