If you'd like to pitch a project, please send us a tip with "Insert Coin" as the subject line.

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We first heard about Observos a month ago when it became a participant in our Insert Coin semifinals, but it wasn't until the Hexagonal Research product showed up at Engadget Expand that we were able to see working models of its environmentally aware sensors.

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To celebrate the DIY ingenuity and high tech innovation demonstrated by our intrepid entrants, we're running an Insert Coin Twitter Giveaway that gives a little something back to all the makers out there.

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Now, Insert Coin semifinalist Radiator Labs is working to bring a solution to market that'll make your living space a lot more tolerable, and as an added bonus, it'll save energy at the same time.

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Conceptually, the system appears to be very similar to the Social Bicycles model that we wrote about earlier this summer as part of our Insert Coin series, though that US-based prototype includes a u-style lock, for securing the bike to a post or tree.

ENGADGET: NTT DoCoMo Shared Bicycle Initiative hands-on (video)

If you have a sweet pre-crowdfunding hardware project and haven't entered our Insert Coin: New Challengers contest yet, what are you waiting for?

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So its no wonder that Gal Sasson's Make a Play wound up as one of the semi-finalists in our Insert Coin: New Challengers competition.

ENGADGET: Insert Coin semifinalist: Make a Play is a high-tech puppet stage

Check out the full list of Insert Coin: New Challengers semifinalists here -- and don't forget to pick a winner!

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One of five finalists in our first-annual Insert Coin: New Challengers competition, the Snapzoom is an adapter that lets you connect a smartphone to a telescope or a pair of binoculars for some long-range snapshots.

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