How to make a nice .sig file using CSS
Melvin Rivera has written an excellent illustrated tutorial 
on how to create a CSS signature in Mail.app.
He provides detailed instructions and a sample template, from which you can quickly create a signature of your own:
Of course, this will only work if you are happy to operate in Rich Text format. If you are an old-fashioned plain texter (like me), this tip is not for you.
UPDATE: Melvin has updated his post with some extra information on how Gmail handles CSS.
[Via TUAW ]
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August 5th, 2006 at 8:44 am
[...] He offers some code for a CSS signature. It follows the same principles as CCS signatures for Mail.app posted here in the past, but with all the bells and whistles you could ever want. [...]
October 5th, 2006 at 9:56 pm
[...] It adds another set of options to other tips for creating HTML signatures and CSS signatures in Mail.app. [...]
November 7th, 2006 at 11:16 pm
[...] Most usefully of all, it allows you to add HTML and CSS to signatures without all the messing around with cryptic files with names like 92768111-8FA1-4572-977D-C94D7A5FDB9A.webarchive that was involved in previous signature hacks like this and this . [...]
March 2nd, 2007 at 4:04 am
The images are giving me trouble when i replace the webarhcive file with my own. The correct images and css coding appear in the preview window in the signature tab. when i create a new email and use the signature I created, the image doesnt appear. I see a little blue box with a question mark where the image is supposed to be. Can anyone help me out? I installed this plugin thinking it would help… but no dice.