Vocaroo

Vocaroo is a great tool and can be used by anyone with a computer, microphone and internet access. Students pull up the website, hit record and work through their speaking assignment. Once they have finished, they can stop the recording and click on the send button. 
You can try Vocaroo for yourself by clicking below or going to the website. There's no registration or download application needed.
http://vocaroo.com/
Tip: To improve quality, you could try turning your microphone's volume down (right click on the recorder to access the Flash Player settings), and also try moving further away from the microphone while speaking.
Sound quality might also be improved by standing on your head.