If you are looking for a desk or office from which to work or have spare desk space then you need Desktime. Desktime is a co-working search engine for Chicago and Austin (with presumably more cities on the cards).
Using the Desktime Google Maps based search engine you can search for a co-working space by location. The map includes a number of filters that let you search for properties with high speed internet, parking facilities, 24 hour access etc.
Loosecubes is a website to find and share co-working spaces. Anyone who has a few extra desks or office space can use Loosecubes to rent the space.
If you are looking for a co-working office space you can use the Loosecubes Google Map to find a desk near your location. You can refine the results shown on the map to show properties that are available to rent by the day or those that require a minimum of a month. You can also refine the results to show 'open desks', 'private offices', 'conference rooms' or an 'event space'.