I recently learned that the syndication icons have become standardised. Mozilla designed the icon originally, and at the end of last year, Microsoft adopted and adapted it. Nice move.
The number of syndication formats had multiplied dramatically, as had the icons available, with different icons for different syndication services, different websites and so forth. It wasn't always easy to find the syndication feed, or even to know if one existed, so a nice bit of standardisation goes down well.
Now, if only Microsoft would implement CSS in a standard way and remove some Internet Explorer bugs!