Webmail for Linux Desktops provides a generic mailto: handler and webmail config dialog that lets the user choose his preferred webmail provider on first run and through the desktops Preferences->Webmail facility.
When clicking on mailto: links on your desktop or in your browser desktop-webmail will take care that the user gets redirected to his webmail of choice's compose webpage with the proper fields pre-filled in.
Currently default webmail providers are: Gmail, Hotmail, Yahoo and Zoho.
Currently this is available for ubuntu lucid
Install this application using the following command from your terminal
sudo aptitude install desktop-webmail
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