Here's my tutorial:
Create a Gmail account
Create a Twitter account, and verify it
Go to TwitterCounter.com and click "Your twitter stats"
Scroll down and click "Add yourself. It's free."
A Twitter window will pop up, click "Allow"
That window will close itself and you'll be logged in, click the "Twittermail" tab
Copy your secret Twittermail email address
Turn off "Post an attached image to twitpic"
Find the "Twitter password" box and type it in
Turn "Send replies to my tweets to my email address" and click "Save settings"
Go back to Twitter and click "Settings" at the top, click the "Notices" tab
Make sure all options are off
Go to your Gmail account, click "Settings" at the top, click the "Forwarding and POP/IMAP" tab
Send your Google Voice invite to your Gmail address.
You'll get an email for Google Voice. Set up the account. Make sure to get a new Google number
Log in to Google Voice, click "Settings", click the "Voicemail and SMS" tab
Make sure "Forward SMS messages to my email" is on and click "Save Changes"
If you've already got Twitter and Google Voice:
Go to twittermail.com and set up an account. It's a crappy site and you may need to reload a few times. Sometimes not.
Twittermail will give you a
randomEmailAddress@twittermail.com.
Make sure your Google Voice settings have SMS messages sent to your email.
I've only done this with Gmail but it should work with an email service. Have that email forwarded to your twittermail address.
And, that should do it.
I have agora411 and 420at420 ready to go, just need GV invites. PM me about that if you've got 'em. I think an NH TextPorc411 may be in order, a Traveling Porc411 for MHD and Liberty Caravan and such maybe.
There's more to come with using the twitter API directly, using Google's speech to text engine, and scraping those emails a bit. Looking into that now.
Lotta ins, lotta outs.