I use Feedburner feeds for my professional feed management needs. Addition of FeedFlare gives your subscribers more interactivity with your feed with easy ways to email, tag, share, and act on the content you publish. See Feedflare in action in my feed.
Become a Feedburner FeedFlare Developer
FeedFlare Developer Guide explains how to use the the open Feedflare API to create and share new Flare units. Flare Catalog lists some Flare units created by the developers. These are simple XML files hosted on a web server that FeedFlare developers have created.
You too can create your own FeedFlare units based on the FeedFlare API. For more ideas, see the Wishlist: 101 Flares for a Better Tomorrow
Here are some Feedflare Units I created. It is simple. Believe me, you can do it too. And become a flare developer!