If you’re regular Gmail user and frequently sending mails in different purpose such as personal, business or clients. To sending same signatures in every mails — it’s not good idea nor to write different signature good idea.
Blank Canvas Gamil Signatures a mozilla add-ons which enabled four custom HTML signatures based on different account you’re sending the messages from. More easier and fastest way you can handle all of your works plus time.
Whenever installed – you should see a drop-down menu and will get scope to select anyone from four custom signatures. You can manage from your gmail or use HTML editor and also include small name for each signatures – later easy to grab your desired one.
This add-ons still on experiment, you have to register on mozilla’s firefox add-on’s site to download.
How to: Get multiple custom signatures in Gmail [via cnet/webware]