Here you can watch live TV channels. There are a lot of channels to choose from a wide range of topics.
Have a look at this fantastic webpage if you want to practise your listening comprehension.
To watch -and listen- it properly, you have to install the Java plugin. Don’t worry about the installation process, it’s quite automatic.
In this webpage you can find a lot of videos in order to practise different topics in English. http://thedailyenglishshow.blogspot.com/