it looks like 0.70 is registering the bitcoin: URI protocol (at least in Windows) but if I already have the bitcoin client running, I get an error.
Same error on my end, when clicking the provided URI to pay the Bitcoin Foundation of all things. (W7 64bit)
In short: When Bitcoin-Qt was
not running, the application would launch normally, and then proceed to do... nothing in particular.
(I'm assuming something is meant to happen at this point. It doesn't.)
So, I kill the application and click the link again. Same result. With mild annoyance, I repeat this a this a few times over.
I try to find some way to manually paste the link. (Because that sounds like something one should be able to do.) No luck there either.
At which point I give up and extract the address from the URI (no plaintext address was provided)
After conceding defeat, I finally manage to paste the address, smack a label on it, add the specified amount and
do the transaction by hand, while trembling and cursing in terrible anger.