GameDesk - GameDesk doesn't have jobs posted on their Idealist page at this moment, but you have to think that some will be coming as the launch of the school gets closer.
LitWorld - Just as I have big goals to keep putting people into exciting jobs, LitWorld has some serious ambition—and that's going to require new faces.
SOSMentor - If you like the sound of the work that SOSMentor is doing, then you should check out their Jobs page.
ManhattanGMAT - If you like the test prep market and think that it could be a cool place to start your career, then you'll want to check out Careers with ManhattanGMAT.
Urban Enrichment - If you want to get in with an exciting startup non-profit like Urban Enrichment, you're going to have to reach out to them before they start posting jobs.
ARKive - ARKive has put together a fascinating resource on endangered species, and you should really spend some time checking it out along with their jobs.
Grassroot Soccer - If Grassroot Soccer sounds like something that you want to be involved with, then check out their Join the Team page.
Achievement First - The success of Achievement First's schools has proven that "demographics aren't destiny," and you can help them achieve their mission of improving education.
DonorsChoose.org - DonorsChoose.org has created an amazing platform for giving, and I've heard nothing but good things about it. I'm sure it'd be a great place to work.
Extreme Sports Camp - If you'd like to join the staff, you should check out Extreme Sports Camp's Jobs page along with their job application which lists positions.
Institute for Environmental Awareness - There's not much more information about the Institute on their website; however, their job descriptions tell you a lot about what they do.
Academia.edu - If you're as excited about this idea as I am, you should check out Academia.edu's Jobs page. Right now they're looking for a Software Engineer.
The Food Trust - If you think the answer to hunger and poor nutrition goes beyond 89 cent burritos, then you might want to check out jobs at The Food Trust.
Flat World Knowledge - Flat World Knowledge is a Nyack, NY based startup that is changing the textbook industry, and they have some exciting career opportunities.
Common Cents - There are billions of dollars in pennies out there, so I think that there's a ton of potential for Common Cents to keep growing. Maybe you can be a part of it.
Rosetta Stone - If you love languages, then it'd be hard to find a company as interesting to work at as Rosetta Stone. And luckily they have entry level positions.