Notches is a free, open, universal platform for reviews. The platform does normalization, entity aliasing, summarization, personalization, spam prevention, gaming detection, and recommendations and provides total access to the database via the API.
Additional Reviews-related API's:

Yahoo! User Product Review API

QuarkRank API

Yelp API

Provider: Notches	Submitted By: APIFinder.com Staff
License: Open (free)	Email: Email this contributor
Price: 0	Connection Protocols: SOAP,REST
Notes: A Developer Key is required to use this API.
Functions: Other Function
Languages/OS: Web Service