Mash-ups are one of the application integration technologies. They are aimed at reducing integration complexity and are advocated as one of the most promising technologies for user-driven integration. Mash-ups allow consumers to draw upon content retrieved from external data sources (web services, data store and web application) and to create new services. Mash-ups use general Web browsing principles and have user interface while web service are primarily designed to support machine-to-machine interaction over a network. Availability of the presentation layer makes Mash-up integration easier. However, there are some limitations of using the Mash-up technology, namely, limited Mash-up framework connector possibilities, scalability, stability and reliability of 3rd party API and reliability, and legal issues. The objective of this paper is to assess capabilities of Mash-ups in developing integrated applications and to identify their application areas. The application integration example using Mash-up possibilities is provided. It shows that using today’s map Mash-up frameworks can be created web solutions that are more easily developed than using web service integration approach.