The objective was quite simple: create a plug-in that uses Twitter to show avatars in comments in WordPress blogs. But after discovering the potential of the Twitter API, the plug-in evolved into a complete “avatar for comments” solution for WordPress. The plug-in was developed by Ricardo Sousa, a young designer with a strong passion for WordPress and Joomla!.
- Loads user’s avatar by matching the email address to the user’s Twitter email address.
- If user doesn’t have a Twitter account, it first tries to load user’s gravatar. If user doesn’t have a gravatar, it loads a default image. This is an optional setting.
- You can set a 2-pixel border to the images (you choose the color).
- You can choose the size: we suggest 24, 48 or 72 pixels.
- You can set an image other than the default one to load if a user doesn’t have a Twitter account or a gravatar.
- It builds a valid image for you (with alt and title attributes, etc.) based on user details.
- Allows you to add a class to the image, so you can style it later.
The plug-in is released under the GPL. You can use it for all your projects for free and without any restrictions. Please link to this article if you would like to spread the word. You may modify the plug-in as you wish.
Download Twitter Avtar Plugins
Credits Goes to: smashingmagazine.com

The best thing is that you don’t need to upload your files manually throught FTP to create your sitemaps.