I think it's time to inform you about a small project I worked on together with Chris Messina from Factorycity. As Microformats have gained much popularity over the last year we thought it was time to standardize the way they are represented on a website. So we created the Microformats Icon Set.
The starter set contains icons for hCal, hResume, hCard, XFN and a generic TAG icon. All Icons are available here in several formats. If you wanna get started immediately you can grab the PNGs, which will be perfect in most cases. If you need additional icons, you can download the Icon Development Kit containing Photoshop as well as Illustrator templates for all icons. Have fun :)
Furthermore we concentraded on special XFN icons, conveiing the relation to the the person linked to.