This post, with many linkbacks to other posts (dee3’s), shows how to embed SoundCloud’s Flash player and allow an HTML5 mini player as a fallback for iOS, using the <audio> tag: http://soundcloud.com/101/html5-embed
The only step that was a little bit tricky was figuring out how to view the cache window and see where the stream was pointing to for the HTML5 portion of the code. In Google Chrome (12.x) I found it easiest to flush the past hour of browsing history and then load the SoundCloud player and see where it pointed to the audio stream, typing About:Cache in the location bar. Anyhow, if you view my last post about Borg & McEnroe using an iOS device there should be a small audio player below the YouTube clip. Amazingly, it’ll even let you stream that clip over AirPlay.
So that’s kind of cool. If that’s what you’re into.