Simple but useful Mod.
Simply highlight the reference you want to direct users to and click the Wikipedia button (use the "W" button above, next to the Spoiler button), and it will send them to Wikipedia for more information (if it exists there).
[wiki]Simple Machines Forum[/wiki]
[wiki]4 cycle engine[/wiki]
[wiki]Jesus[/wiki]
[wiki]Atheist[/wiki]