Blogs were originally used a web based diary, but may now also be used more generally as a discussion site where people comment on a diary entry or article.
Podcasts are like a radio file that can be downloaded and listened to whenever the user wants to.
Browse the following links for a selection websites with good information on Web 2.0 and other emerging technologies for libraries.
Social bookmarking allows users to keep track of their favourite sites, and then access them from any computer with an internet connection.
Broadcastr is a new mobile platform that lets you upload audio content linked to a particular location. Users can then download, and listen to, the audio related to their location
Wikis are collaborative websites that allow anyone with access to them to add or edit material.