Jim, perfect idea with some logo indicating wallet compatibility! This should cover BIP32 + some mnemonic algorithm for easy transferring of wallets across various clients.
 
Btw I asked ThomasV for making BIP from his mnemonic algorithm and he agreed, so I believe some proposal will be here pretty soon.

slush

On Tue, Dec 4, 2012 at 7:56 PM, Jim <jim618@fastmail.co.uk> wrote:
Also, as BIP32 support is added to clients and codebases then the actual
variant of software to use to access your wallet will become relatively
less important. Combined with a standardised seed -> passphrase
algorithm the user can just type in their long passphrase into any BIP32
compliant software and click/ buzz/ whirr : there is their wallet. We
should have a little logo for HD wallet compliance ! :-)