Advertising helps free products and sites stay free. Of course they can be annoying, but you have to understand that without them products and websites will soon run out of fire-power.
However, Digsby the multi-protocol instant messenger is now allowing users to opt-out of ads. Yes, the ads are actually optional. The options for disabling ads is available in the latest build 86. So if you have been annoyed with the ads, you can simply go ahead and disable it by going to Options -> Conversations.