Rentmix

Aiming to be the "Google of vacation rentals", Rentmix lets you browse 250,000+ short-stay pads (as sourced from listing sites Homeaway and AirBnB) by plotting 'em on a Gmap and letting you filter by min/max price, date, # of bedrooms, and type of residence. Each pin clicks to reveal a slideshow, a link to contact the owner, and property specs, though they'd be way more attractive if they just took their glasses off.