[Brian]

As far as I know, there's no third-party access to Siri yet.

That said, we might be able to hack something together with the Omni Sync Server. Theoretically, you could use Siri to dictate/send an email your account on the server, which then adds the item to your database on that end.

Your various devices wouldn't know about the item until they next synced, but if all you need is to capture something you don't want to forget, it might be enough. I'll file the feature request. I am not an engineer, so I really have no idea how feasible this actually is. Take it with a bigger grain of salt than usual I usually prescribe. :-)