With a little bit of HTML and a couple of Mozilla Firefox Plugins you can make a pretty slick looking HTML signature for Gmail.
Here is what mine looks like
1. Firefox is Required. If you haven't made the switch.. go for it.
2. Download Greasemonkey – it's a firefox plugin.
3. Download a Grease Monkey Script called: Gmail HTML Signature. The script should install automatically when you click on "Install this script" button in the upper right hand corner. Here are some additional setup instructions from the script creator.
4. Prepare the HTML. It helps to know a bit about HTML, but if you don't feel free to use my snippet below, inserting your own information where appropriate.
<table><tbody><tr><td> <img src="http://farm3.static.flickr.com/2363/2237613114_5ff587490a_o.jpg" /> </td><td></td><td> <div style="padding-right: 5px; padding-left: 5px; font-size: 11px; padding-bottom: 5px; color: #666666; padding-top: 5px"><strong>Chris Pollock</strong> <br />
<a href="mailto:firstname.lastname@example.org">email@example.com</a> <div style="font-size: 10px"> <a href="http://sim.plified.com">my blog</a> | <a href="http://www.linkedin.com/in/chrispollock">LinkedIn</a> | <a href="http://www.flickr.com/photos/pollocks">flickr</a> | <a href="http://del.icio.us/cwpollock">del.icio.us</a> </div></div></td></tr><tr></tr></tbody></table>
I created a thumbnail avatar (50 by 50 pixels) and uploaded it to Flickr. You'll want to replace the image with your own image. To get the picture URL, click on "All Sizes" on your photo page and get the URL in the text box at the bottom of the page. You can also replace your own list of links below your name and email.
When creating this code you might want to assemble it in a text editor. Notepad will do.
5. After you've installed the Greasemonkey script, you'll see a "create signature" link next to your email address when you go to compose a message. The first time you compose, click that link and add the HTML code that you prepared. Click "Save Signature" and you should be set to go.