From within the settings page of Gmail you can now create rich text signatures including changing font site, text align, style, colour, add images and links etc
Though this has been one (simple) feature missing from the product for a long time its not something I have missed. I know too many companies that abuse this feature and include un-needed images and just streams of multi-coloured text and links. Don't get me wrong, I am happy to see it, I am going to use it, but I am scared to see how some people will implement it.