I came across a very cool voice synthetizer. It can create male and female voices in French, US English, UK English and Latin-American Spanish. I did a few tests and I have to say that the French voices are incredibly good !
And here comes the best link of the day : Radio-Locator. This website is a radio station search engine linking to over 10,000 radio station web pages and over 2500 audio streams from radio stations all over the world. And they have the Radio Caroline stream ! You can listen to all this streams using Media Player Classic, a free and open-source audio and video player.
Edit : Media Player Classic v220.127.116.11 does not seem to be available on any Sourceforge mirrors but you can download the latest version here.