Yes. You can now customize your signature in GMail. This is a feature that I had been waiting for GMail to introduce. There were times when I wanted to introduce my services with a few links to content to my clients on Elance, Guru and oDesk, the freelance sites where I am active. One of those Firefox addons that I used was Wisestamp. The problem with it was if people were accessing mails through their Outlook, Evolution or Mozilla’s Thunderbird or other mail clients they were unable to read my custom signatures. Wisestamp displays my latest posts when I added my RSS feed to it.
Tip: How to customize your GMail Signature
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All you have to do is log into your GMail account (Created an account here if you do not have one) and login. Click on settings tab that you find on your right top hand side. There under the general tab, scroll down and you will find the Signature box. Now you will see a rich text editor. Enter the text like your name, a designation with other contact details. You can format the text, add links and insert images to add more value to your signatures.
Images You cannot add images from your desktop. However you can add images from the web. In case you want to add a logo or a specific picture, I suggest that you upload to your Picasa or Flickr account. Add tags to the image. Copy the link to the image and add it in the Web Address URL box that pops up when you click on the insert image icon. If the image is small and the URL you entered is correct, it shows up almost immediately. Save your settings. Now click on the compose mail link and in your mail composing box, you should be able to see your signature in all its glory. To edit it, you need to go to settings and tweak it.
In case you already have multiple custom addresses, you can create a unique signature for each address.