saluete omnes amici conlegaeque!
A propos bearded's remarks (# 10) and aefrizzo's (# 11), I suspect this is a matter simply of terminology. After a lifetime (nearly!) of studying, and teaching, Latin, I can safely say that I have never come across the term 'future imperative' in any grammar-manual or school textbook designed for use in English-speaking educational contexts—though I am aware of some terminological differences between those published in the UK and their American counterparts (US textbooks, for instance, sometimes subsume gerundives under 'participles'). This is in contrast with ancient Greek, where regular verbs may have (at least) present- and aorist-tense imperatives, and a conjugated future imperative is at least conceivable (e.g. γράψε or ποιήσε). And in one sense any imperative, in any language, has at least a future(-ish) aspect, in that if it is used at all, it implies that the enjoined action has not yet been performed at the time of the utterance.
This makes it unclear to me what the conceptual difference is, or would be, between a 'present' imperative and a 'future' (though in classical Greek the aspectual distinction between present and aorist is to me perfectly transparent).
Thoughts anyone?
Σ