How to Insert LinkedIn Email Signatures In Gmail
LinkedIn members can create HTML based email signatures that may have your contact information, website addresses and even an image of your company logo. Here’s a sample LinkedIn signature embedded in a Gmail message.

You can create a personalized signature for your own Linkedin profile here.
Since the LinkedIn signatures are done in HTML, you cannot directly add them in web email programs like Gmail or Windows Live Hotmail since they do not support HTML email signatures. (Yahoo! Mail is an exception).
There’s however a simple workaround (Also see: "HTML Signatures in Gmail").
All you have to do is open the LinkedIn Signature Generator website in one browser window and the Gmail compose message pane in another one. Now select all the text in your LinkedIn Signature and drop it onto your Gmail window.
You’ll be surprised that Gmail gets an exact copy of the signature with all the formatting and the background image. If you can’t get the drag-n-drop thing to work, check this video for a quick demo:

Definitely a great workaround. Too bad you have to do the drag and dropping every time you want to use the signature - would be great if GMail would just allow HTML signatures and be done with it.
You had the same crappy idea for Feedburner Signature in Gmail too.
I lost 3 minute of my life reading this blog post
Great tip…even works in Google Apps emails.
But I second Michael, it would be great if they would allow html.
That’s a very useful trick. I use Evolution mail on Ubuntu and the signature doesn’t load properly. Some of the embedded images in the signature dont load. Any clues???