So last night I gave a presentation on In-App Billing using the Android SDK at the St. Louis Mobile Development User Group (hosted at Asynchrony).  This was a first for me, as I have only presented on .Net or DotNetNuke topics at the St. Louis .Net User Group or St. Louis DotNetNuke User Group meetings. All in all, it went very well.  I surprised myself by actually knowing the topic fairly well, and the questions posed by the attendees were pretty answerable.  The presentation itself (which will be posted soon) covered: why Google provides an interface for In-App Billing, and not an interface for In-App Purchasing the business and technical requirements for developing against the service some pointers on testing...