BBC Learning English - Talking Business - exercises, advice, audio etc for typical business situations like phone call, meetings, presentations and negotiations.
BusinessEnglishPod.com - many podcasts and videos for upper intermediate and advanced learners of English. (For students in China, the videos are usually on Youtube but on the Business English Pod pages there is a small "Download" link that works for China.)
BBC Learning English - English at Work - an audio drama series, short episodes about life & work in a company. You can download the audio in MP3 format, and the script in PDF. (Version for China, with extra commentary, vocabulary & explanation in Chinese.)
ESLBusinessNews.com - free audio downloads of business news reports read in slow, clear English. Ceased in 2007 but it still has some useful things online.