Shoutbox

I agree with Choli and Cookie. However I support the idea of including more help in several forms.

For example, "Tip of the day". I'd add a softly animated icon on the Plus sidebar (the vertical bar to the left of the text input in the conversation windows) that would prompt a little window showing a tip and a link to the feature (or the explanation on how to achieve a certain "obscure" feature in MP!, like for example, formatting your nickname). After prompting once a day (or each reboot), the icon would vanish. This could obviously be disabled in preferences.

Compiling a help file is much too much work and is usually pointless, because it's probably the last place most people will ever check. However short 'n smart advices may help the user to dive deeper into MP!.