Remember to Speak Here Now
Version 2.1 of Speak Here Now just got released on the Android Market. This update includes the ability to dictate a task and have it added to your Remember The Milk lists.
Simply say, "REMEMBER" + [whatever your task is]
For example, "Remember cat food tomorrow list shopping." This will add the task "Cat food" to your list Shopping and set the due date for tomorrow. Hopefully this will make it even easier to never forget anything.
You can download the newest version from the link at the bottom of this page.
And if you're a developer, remember to check out how you can enable your application to respond to custom commands from Speak Here Now. You can find out more about that here.