An increasing number of real-world entities is currently being connected to the Internet and the World Wide Web. We argue that this development is the precursor of a Web of Things (WoT), which in turn provides a promising way to prototype UbiComp applications, by significantly lowering the technical barriers for making things "smart". In this paper, we outline how sensors, actuators and Web services can easily be combined in the WoT in order to enable rapid prototyping of UbiComp applications. Author Keywords Web of Things, Rapid Prototyping, Physical Mash-Ups ACM Classification Keywords H.3.5 [Information Storage and Retrieval]: Online Information Services