2) I couldn't get the PHP CURL example to work, as is (of course putting in my own credentials).
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I use a normal HTTP POST. Did you changed the credentials key that is displayed in the PHP CURL example? Then it won't work. The credentials key in the example is actually your own personal api key.
So you have one key for the email interface and another credentials key for the HTTP API.
I also use Prowl, but I think I will stop using it because this API has much more options, like sounds and using links in de notification dialog.
During testing I found out some new sounds. Especially 6.caf
