Go online to book a hotel room, and you'll be bombarded by options from Las Vegas to Laos, in no particular order.

There's also a constellation of hotel-sorting Web sites to help travelers find their way to the deals. Some of these businesses, such as Expedia, Priceline, and TripAdvisor, have been around for years.

But other, less well-known sites can also steer you toward exceptional hotel deals or experiences. Some specialize in boutique hotels; others offer unusual amenities such as eBay-like auctions for hotel rooms or even surprise vacations.

Here's a sampling of some providers that have found a niche in this crowded market.

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