Dwellable, launched a year ago by Adam Doppelt (a co-founder of Urbanspoon, since acquired by IAC) and Rob Currie, is a rental search site that includes all listings for free, providing access to more than 50, 000 vacation rental listings across the United States in markets including Cape Cod, Colorado, Florida, Hawaii, Hilton Head, Lake Tahoe, the Outer Banks and San Diego.