Jon has developed a wonderful Greasemonkey script which adds the Gravatar of the person, the email was from, to Gmail when reading an individual message.
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To use this script, you must have installed the Greasemonkey script add-on for Firefox.
If you haven’t uploaded your Gravatar yet, visit http://gravatar.com/ and upload your picture here.
A gravatar, or globally recognized avatar, is quite simply an image that follows you from site to site appearing beside your name when you do things. Avatars help identify your posts on blogs and web forums, etc. This blog is using Gravatars in the comment section.
You can get this script from here.
Link : Gravatar in Gmail – Jon’s Blog
:)
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This is good.. but from sender point of view we can use HTMl signature to enter our Avatar and other Info…