In reply to Robert Russell:
With two people from the west country a ferry is definately the cheapest option plus you get flexibility there. Our ferry cost us £90 return, we've just booked.
WRT driving around font, a guidebook (Fontainbleau Climbs is the ubiquiteous one, though Jingo Wobbly supposedly have a new one out any day now) is handy and detailed map (1.25000) is very useful, though not essential. La Musadiere is the usual campsite for many climbers though it is also the most expensive.
WRT Areas of fantastic quality, well all of font is quite brilliant, unfortunately the frenchies' liking of pof means that many of the starting footholds on lots of the boulders are horribly polished, it's something you have to live with. Personally my favourite area (though I've only been to four!) is Cul du Chien, though you won't be alone there!