Yes, I did :). As mentioned below, it's not a comparable product. Custom Search is site-specific. It's an API for the "search this page using Google" forms you sometimes see on blogs and the like. It's not an API for "capital S" Google Search, while Bing's API really is their Search API.
Ahh, gotcha. I thought Custom Search was that old thing they had which let you create a "customised" Google Search which had your colour scheme of choice and optional restriction of the results by topic (i.e. basically standard search), not the equivalent of 'site:x'.
