[BrotherLovesDub]

i found this info. assume it works with Groups as well:

How do I moblog?
Tip: Keep your unique email address a secret. Anyone who knows it can post to your blog.
On the top navigation, the Account link will take you to a page with your settings and profile information. Click Mobile Setting on the side to see your moblogging options. This page will give you the unique email address you need to use to moblog. It will be a long string of numbers and characters.
We recommend that you copy and paste or email your unique email address to your device to avoid missing or incorrect characters. It's also a good idea to to place the address in your phone's address book so you don't have to type it each time you want to use it.
Next, compose a new message in your email client or device, addressed to the unique email address.
The Subject or Message line will be the title of your post. The body of the email will be the body of your post. Now, send the message. It will automatically be posted to your blog!
Note: If your phone can send text messages to an email address, then you can also moblog by sending a text message to your moblogging email address.


edit: you can specify which groups you want to post to under Accounts.