#1
Top of the list is Flo-joe. What a wonderful webpage full of free on-line FCE exercises. There you can put your 5 skills to the test (reading, writing, listening, speaking and use of English). Give it a go.
#2
Have you heard about TED ? This is a webpage where you can see videos of famous writers, scientists, politicians, etc giving speeches on a wide variety of topics: literature, art, personal develpment...
This is one of my favourite videos, author and activist Isabel Allende discusses women, creativity, the definition of feminism and of course one of her latest books "Tales of Passion".
#3
The social networks. Try Twitter, Facebook and Skype. Start making English speaking friends and interacting with them. Whenever you learn a new expression record it in a notebook and make sure you use it as much as possible.
#4
What about Youtube?
There are some really fun videos and you can learn a lot from them too. Practise your listening skills and learn some vocabulary at the same time.