Garrett Camp, cofounder of Uber and Blackjet, has launched a beta test for Reserve, a "digital concierge" that works like a souped-up OpenTable. Solving the problem of getting a table at high-end restaurants has become a real passion project for entrepreneurs lately.

Blackjet, the Uber for private jets backed by Jay-Z, Ashton Kutcher, Will Smith, and Shervin Pishevar, has laid off most of its employees after additional funding did not come through, reports Boston.com. Last month, we reported that Blackjet was "basically over" and "fucked" and it's hard to see how the company could recover from these revelations from a former employee.

Of all the "Uber for __" propositions, the splashiest by far was Blackjet, the app that purports to help wealthy users book seats on private jets (for a $2,500 annual membership fee). When it launched last October, the company touted A-list Hollywood investors like Ashton Kutcher, Jay Z, and Will Smith, not to mention connections to successful—or successful-seeming—companies like Uber. But sources tell Valleywag that Blackjet is in a tailspin—out of cash, unable to raise funds, and "basically over." Another source said: "They are fucked."