Although I would vote yes to the Lisbon Treaty if there were a referendum, I must admit I’m not a great fan of it.
Just like the European Constitution it replaced, it’s full of specific rules accumulated over years that just makes the whole document incomprehensible and unlikely to last very long before amendments are needed.
I firmly believe a constitution should be brief and general, like the US Constitution or the Danish one.
The Economist made a good proposal eight years ago, and although I don’t believe with all the specifics, I agree with its form, scope and length.
I think many voters would understand why it was needed, and it could make it possible to change some of the mechanics (such as voting rules) without having to get unanimous agreement, while still giving all countries a veto right in other areas.