I think it may be worth noting that Basecamp 3 has been out for 3 months already and Basecamp has not clearly noted the timeline for an API's release. Addition

I think it may be worth noting that Basecamp 3 has been out for 3 months already and Basecamp has not clearly noted the timeline for an API's release. Additionally, this comment does not inspire confidence: >We have some 12 developers who have to manage every single version of Basecamp and other legacy products, as well as all new development on Basecamp 3.