Agreed.  mBTC is probably the only fractional denomination that will ever be needed in practical application, but mikes allow room for extra precision when necessary.  Both are easily expressed using existing character encodings (mBTC / uBTC) and prevent the absurdities of trying to verbally communicate small fractions in decimal format.  I think it would be wise to dispense with BTC "cents".  They aren't really any better than millies in my opinion, and not having them sets BTC apart from most other currencies.