Thanks for the handy plugin, mrwiblog!
Do you think it would be worth considering these development ideas for the plugin, to make it even more versatile:
- sending mail only to Blog Owners aka Administrators (I have one admin per blog and the rest users are editors or lower users)
- sending mail only to those who have an active blog, thus not sending mail to anyone who doesn't have (an active) blog associated to their user account
Those two options would make this tool a great way to send announcements to WPMU-bloggers. :)