DONT EVEN THINK ABOUT IT dude ...
They are scammers ... every single one of them.
They will pay you ... you will send the goods ... AND THEN ...
If they pay by credit card the amount will be chargedback (or the CC will be reported stolen)
and if they pay by check then the check (which if is issued by a Nigerian bank will take a looooong time to prosess - very conviniently) will be a fake or stolen in which case u end up screwd again.
Dont do it ...
if you want to read up on Nigerian scams or scammers in general visit
www.quatloos.com .. which is a very cool site teaching people about how to avoid scams etc..