Yes - in the UserCP under Settings (right at the bottom!)
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I don't mind the @ at the front - though can we not auto-add the semi-colon if the @ prefix is used with a valid username?
Btw... shouldn't we merge this and the "@Username" thread now?
Automatic tagging sounds a good idea until someone takes the name iPad, FOIA or ID10T (apologies if I've mentioned any real usrs, but I'm not off to check!)
Prefixing with @ is good idea to stop auto tagging by accident.
As for the semi-colon on the end, we'll soon get used to it :)