UberConference is a similar service but focused more on conference calls.
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We use ScreenHero at GA, and I've found it to be a great tool for pair programming across time zones. My only wishes would be Linux support, and the ability to have multiple participants.
I use screenhero all the time with my grandma, she loves it. i find voice chat totally useless though
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Hunter
The Best Screen Sharing out there. The guys went through YC W13. Built clients for Mac and Windows. Added voice chat last year. Constantly making the product better. And were able to sign up my non-technical partners, which happens rarely with new tech products :)
Osaurus
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