Thanks chodpaba.

Regarding D.H.'s client - I was also thinking about direct integration with Dropbox but with stories like this one about lapses of security, I'm not sure it's such a good idea (even with encrypted wallet - why expose yourself to attacks if you don't have to). My current thinking is to simply let the user specify a list of backup paths that the wallets will be automatically replicated to. I haven't figured out how to make the UI 'mom-friendly' but it would then let the users pick the backup service of their choice (I do like Crashplan btw). Not forcing everyone's eggs into the same basket is probably a good idea.

I really do like the suggestion of displaying insufficiently verified transactions as 'in progress' - I think that works even better than my iconic representation of the state. It would also help communicate to the user why there is a fee on spending these young transactions.