In reply to be4con:
There's an entire article to be written about which guide to take to Font, and maybe I'll get around to writing it sometime, because it's a perennial question partly because Font is so popular and partly because there's no 'right' answer.
In my experience, the answer largely depends on your approach to the area. Is it circuits, is it random problems, or is it quite specific problems that you're looking to do? Each guidebook is better for one or the other, but none do it all. For instance, the Boolder App is absolutley amazing for finding your way around between problems/circuits; however, it's absolutely crap to browse through for inspiration. I'd definitely recommend downloading it, not least because it's free, but I'd also take a guidebook with you too.
Jingo Wobby tends to divide opinion. They're certainly not perfect, but I like them, and despite being weirdly un-user friendly in a great many ways they're actually the most conventional guide to the area - insofar as if you've used a Rockfax guidebook, you can probably get your head around Jingo Wobbly, and that counts for quite a lot. They're also filled with action shots and topos, which many others aren't, and I think people like that, partly so they know what they're climbing and partly for inspiration. As a result, I'd say that they're perfect for the Font first-timer, although I'd equally say there's a mountain of stuff in there for people, including myself, who've been many times before.
The 5+6 and 7+8s guides are cult classics which a great many people rave about, but they too have their limitations. Initially I found them extremely frustrating to use as you've got to look at the back for the maps, then the front for the problems, and I found myself flipping between the two all too frequently; however, in time I got used to this and grew to like them. In recent years they've become quite confused by the various circuits throughout the forest being updated/re-painted, which means that a lot of the information within them is out of date, although the various new editions do resolve that my concern is that the same will happen again, and given that there's no pictures of the problems it's very hard to figure out what's what when you're main reference point to where the problems are is whether or not they're close to Blue 5 or Red 6. Overall I'd say that the 5+6 and 7+8 guides are more popular amongst the devotees.
Bleau.info is a great resource, but is best suited towards those looking to climb/research individual areas/problems. It's a great place to get beta too, if you're in need. I've used the App, but not paid for it, although I'd find it hard to justify the expense knowing how good Boolder is.
The Baton Wicks guidebooks (old purple, new white) are no longer worth purchasing due to the fact that half the circuits within them have changed. Save yourself the money, because they're basically defunct.