In reply to ChrisBrooke:
Interesting question, and one that I've thought about several times before, but Michael's answer is ultimately the reason I've refrained from actioning it.
Funnily enough the actual idea I had was to run a series similar to the 'Five Best' one we did for each of the Trad grades, only with Font grades; however, I do think there'd be sustainability issues as a result of this - particularly on softer rock such as sandstone or gritstone. Whilst with trad climbs people tend to give them a single go, bottom to top, with boulder problems people tend to have multiple attempts - hence they receive much higher wear.
It'd be devastating knowing that an article I'd written about an amazing set of problems resulted in the destruction or demise of those problems.
That said, I still wonder about one for sport climbing...