This seems so basic, but if you’re trying to spread the word about yourself or your brand, do you have an interactive, visually pleasing signature?
I’m a fan of the (free) WiseStamp myself. It’s a browser-based plugin (meaning you need to install it on all machines you use; it’s not traveling with your Gmail account) that allows you to customize the font and color of your signature and add links to relevant social networks. Share your Facebook, Twitter, Flickr, Yelp, WordPress, Youtube…even Etsy, Ebay, and Amazon profiles. You can use those cute little icons, or text, or both. Who doesn’t need fun colors added to his/her signature?