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When creating web sites, as with any software product, it is important to ensure that a high level of usability is attained. If sites are not usable, users will leave and find others which better cater to their needs. As a result, effective evaluation techniques are required to determine the usability of web sites. Current techniques include the use of heuristic evaluations based on criteria developed by Jakob Nielsen. There is little evidence to show whether these traditional approaches are still appropriate for Web 2.0 sites. This paper presents the findings from an evaluation of three Web 2.0 sites which involved both heuristic evaluation and user testing. The aim of these evaluations was to determine whether the results of the heuristic evaluation accurately reflected the users' experiences and opinions. The results from the heuristic evaluation indicated that each of the three sites failed in some respects. In contrast, the findings from the user testing showed that users found the sites easy and logical to use and believed that the needs of the users had thoroughly been taken into account during the design process.