Looks like a nice service -- a couple of quick questions came to mind while I'm getting started:

Is there a particular reason I can't send bitcoins to myself? I just wanted to see how the thing works, and would prefer not to create a throwaway account for that.

I tried to transfer 0.1 BTC to my inputs.io account a while ago, but it isn't yet in my confirmed balance even though blockchain.info shows 3 blocks within the last 10 minutes. Yet the FAQ states that incoming transactions < 5 BTC only need 1 confirm.

Any chance to disable the PIN check for small amounts, like 0.001 BTC? Ideally I'd like a tipping widget with as little hassle as possible (security not a big concern - think Flattr)

It would be nice if the donate button were to also serve as a easy gateway for those users who don't yet have an inputs.io account. Instead of seeing "Register or log in", which tends to turn users away, you'd see something like "1) Got inputs.io? Log in here,  or 2) Send X bitcoins to this address and optionally enter your email to get a free inputs.io account". I imagine it would help newcomers to adopt the service.