[unbudgingprawn]

Number of transactions would probably be a better metric

http://blockchain.info/charts/n-transactions

[pistle]

"WARNING: Forgotten passwords are UNRECOVERABLE and will results in LOSS of ALL of your bitcoins!"

I hate when my banker says this to me about online banking.

[StavrosK]

Then use Coinbase, which says "you'll have to trust us with your coin, and hope we don't get hacked".

[aianus]

Honestly, I prefer it to "WARNING: Your password must be 6-8 characters and contain no numbers or symbols"