More on the Stealth Speedboat: "Commenter Murc points out that the stealth speedboat noted last Friday is most likely a SEALION (SEAL Insertion, Observation, Neutralization) technology demonstrator. While not planned to enter full-scale production, the first SEALION has been in testing for some time and a second will be delivered later this year.As a technology demonstrator, SEALION I is not armed but is designed accept a variety of modular mission payloads and could accept a modular weapons system, according to program officials"

(Via Defense Tech.)