THIS IS A GREAT PLUGIN
Empower your webmail signatures in Gmail, Google Apps, Yahoo, Hotmail, and AOL.
WiseStamp a signature creator includes many exciting and improved webmail signature fetchers such as:

New Features:
? Add your personal feeds (rss)- Automatically Share blog posts, bookmarks, videos, daily quotes in your signature.
? Renaming signatures
Features:
? Personally designed signatures
? Easy setup and configuration [...]