I think you should have one c.v. that is STACKED FULL of everything you've ever done.

and then make a new c.v. from that when you need it (like Luis said, for your audience).

WHAT I DO:
I have a one page "select solo and group exhibitions" c.v and that's the one I use the most...
it's for gallery shows and my rule is.. it's gotta be REALLY GOOD or it's not on there at all.

It was made from that "master" I keep tallying on. I ALWAYS make sure to write on the master whenever I do anything... charity auctions, painting a mural with kids, WHATEVER... at least go back once a month and try to write it all down.
Then, anytime I need to, I can refer to that big threee-ring binder and pull out other lines for creating a nother mini c.v.... So that way, if the job or the environment called for it. (when making that one page) the c.v. SING when you need it to!