This is pretty cool: Mulebone, the newish restaurant that replaced Eatonville at 14th and V, is now operating as a coworking space during the day called Share Space DC. The spot, owned by the Busboys and Poets folks, shifted its concept a bit and changed names about a year ago and now includes a vintage store. Share Space DC started operating last month.
Unlike some coworking spaces, there isn't a membership fee, they serve food from an all-day brunch menu, $3 unlimited refills of coffee, and they serve alcohol at the bar. There are also private meeting rooms available for a fee. And since it's a restaurant, you'll be sitting at the tables. (It's a pretty nice space, I might add.)
Clever idea -- why let a restaurant sit mostly empty during the day when you could use it for something that's in demand? I plan to check it out sometime.