The SMPR differs substantially from the traditional press release, which is often long, detailed and inflexible. The new format emphasizes many points of entry, so that journalists and bloggers can pick and choose the information - and the media - that they wish to use. The latter point is important. With so many media outlets today using images, audio and video to tell a story, the traditional press release doesn't meet their needs very well. The SMPR makes room for story-telling through whatever media the publisher wishes to use. It requires more work on the client end, but should result in much better results.
Another innovation in this new version is its use of popular back-end services like YouTube and Flickr to host content. This means that people can find the information through search engines as well as via the press release.
Maggie has made the template available for anyone to use under a Creative Commons license. She has a more detailed explanation here. Or you can just download the template in PDF format.
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