Aardvark (or sidepilot) is a great example of customized collaboration tools for an unexploited niche (home users giving tech support to friends and family). It also has potential for small businesses just getting their feet wet with collaboration tools.
The innovation in Aardvark is on the business and marketing side, not the technology. Until a few months ago, I would have balked at paying $50 a month to gotomeeting for a monthly subscription. Something like Aardvark (where it seems you will pay by the day, with a credit card) would have fit the bill perfectly.
Links, links, and yet more blog links about project aardvark