That is a much nicer looking client than the current one.
I think perhaps if we used an interface like that of AllBitcoin, in that it support descriptions and has two panes, and then we included the additional information from the original bitcoin client and Spesmilo (transaction status, etc.), we could be on the right track.
Ideally though, I think the client should look something like online banking sites do (except somewhat more Web 2.0ish).