I was just cruising the Earvana website after following a link from Strat-O-Blogster, and I noticed that Earvana is working on a compensated nut for Floyd Rose guitars. This is great news for those of us who love their whammy bar freakouts but wish their guitars had better intonation. 

The Earvana nut optimises the scale length of each string for better intonation between the 1st and 12th frets, so chords sound more in tune and notes ‘sit’ easier in a mix. I’ve tried the Earvana system on a bunch of guitars (including many ESPs) and I find it to be a really useful, unobstructive way of attaining vastly improved intonation.
Perhaps the only option out there that beats it is the True Temperament system, but the Earvana system is by far the cheapest and easiest option. Let’s not forget the Buzz Feiten method though, while we’re having an intonation-improving love-in, but Earvana certainly beats Buzz in terms of bucks and ease of implementation.