Kasper Nauwelaerts, developer of the Safari Tidy plugin, has been developing a Microformats plugin for Safari. I emailed him last year on the off chance that he might fancy having a go! Cheeky, but it worked!
This is currently alpha, but works really well, and vcards and events were added really easily. Hopefully a beta will be out soon!
Safari Tidy: zappatic.net/safaritidy/