I think the jury's still out a bit on the Titus Bode law.
Remember he was creating a rule where he already had 6 of the data points - so it's not surprising that it fits those!
Then Neptune is a pretty poor fit and well Pluto's orbit is so irregular it hardly counts but it's role in the discovery of Ceres is what made it famous.
The real test of whether it's a reflection on some sort of harmonic in the condensing of proto-solar systems will be whether it holds up in a similar way for solar systems outside our own.
There's an interesting and very well informed discussion of that here:
http://www.bautforum.com/against-mainstream/67 011-bodes-law-extrasolar-planets.html