2008 BJCP Style Guidelines
Category 16 — Belgian and French Ale
16E. Belgian Specialty Alehttp://www.beeradvocate.com/beer/style/174/?start=50
Beeradvocate has over 650 examples of the style in this list alone. Some pretty prominent brewers......
Inspired by the American India Pale Ale (IPA) and Double IPA, more and more Belgian brewers are brewing hoppy pale colored ales for the US market (like Chouffe & Urthel), and there's been an increase of Belgian IPAs being brewed by American brewers. Generally, Belgian IPAs are considered too hoppy by Belgian beer drinkers.
Various malts are used, but the beers of the style are finished with Belgian yeast strains (bottle-conditioned) and the hops employed tend to be American. You'll generally find a cleaner bitterness vs. American styles, and a pronounced dry edge (very Belgian), often akin to an IPA crossed with a Belgian Tripel. Alcohol by volume is on the high side. Many examples are quite cloudy, and feature tight lacing, excellent retention, and fantastic billowy heads that mesmerize (thanks, in part, to the hops).
Belgian IPA is still very much a style in development.