As I was perusing the Remember the Milk keyboard shortcuts, I noticed that at the bottom, under "Services", Twitter was listed. So I clicked on the link, and the "Services / Remember the Milk for Twitter page" came up, where I could enter my Twitter id. I was presented with a verification code for the next step.
From there, I typed "follow rtm" and then "d rtm [verification code]".
Now that all that is set up, I can interact with Twitter through direct msg:
"d rtm pick up the milk"
"d rtm call jimmy at 5pm tomorrow"
"d rtm !complete call jimmy"
All the instructions and some command examples are at: http://www.rememberthemilk.com/services/twitter/
Of course, I'm still learning how to even use the RTM Date Formats.
Of course, since I can txt updates to Twitter (40404), I can add tasks for today by texting
"d rtm pick up the milk today"
I don't need a laptop or notepad to record my "action items" anymore. This is awesome.
A much simpler setup is importing a list via e-mail, which enables adding a list in bulk to a specific list (e.g., personal) by specifying the list in the subject line and list items on individual lines in the message body. A downside to this method is that signature lines and legal disclaimers get added (per line) to your to do list. I'll need to research if there is a way around this.