Two key considerations
Original SMR Template from Shift Communications
Updated version here
Site dedicated to the SMR: socialmediarelease.org
How To Write SMPRs by Brian Solis.pdf
The Definitive Guide to Social Media Releases by Brian Solis (Feb. 2008)
Top 5 Principles of the Social Media News Release by Todd Defren
Good intro and analysis: Social Media News Releases (SMNR's) Are Absolutely Worthless
Storyboarding: Another View on How to Use the Social Media News Release by Kami Huyse and Geoff Livingston
SEC To Recognize Corporate Blogs as Public Disclosure. Can We Now Kill the Press Release? by TechCrunch/Brian Solis
Pitching Bloggers
Samples