BBC iPlayer relaunches today in an attempt to develop beyond "catch-up" - adding some new features that see the site integrate deeply with social networking sites, and compete with the personalised, flexible viewing offered by TV platforms such as Sky+. The new beta version at http://beta.bbc.co.uk/iplayer has a redesigned homepage that creates more space by separating TV and radio. Users are encouraged to sign in to the site to take advantage of the new features: it's free, and an existing bbc.co.uk ID can be used.