RobGoldsmith sends word of Interorbital's TubeSat Personal Satellite Kit, which allows anyone to send a half-pound payload to low-earth orbit for $8,000. Your satellite will fly to orbit from Tonga atop an Interorbital Systems NEPTUNE 30 rocket along with 31 other TubeSats. It will function for several weeks, then its orbit will decay and it will burn up in the atmosphere. Interorbital plans to send up a load of 32 TubeSats every month. If you pay in full in advance, you get slotted onto a particular scheduled launch. Here are Interorbital's product page and brochure (PDF).