ccmixter: 'download, sample, cut-up share' - search creative commons archives for music for your video, school project, presentation, podcast, etc. and STAY LEGAL! :)
is a Web 2.0 styled editor having different sections for different functions. The tutorial is not of explanatory kind. The user has to have a fair idea of working on photo editors. It is definitely not for beginners. Registering is required to save your work, hence mandatory. There are a few legal hassles also.