UPSIDES • Small (~4kb) • Free, open-source • No Flash knowledge required: file URL is specified in HTML • JavaScript-ready! You may even bypass the Flash interface altogether! • Autostart capability • Draggable/Clickable seek bar • Simple operation with Play/Pause and Stop buttons • Buffering with progress bar • Buffering is stoppable! (through Stop button) • Volume control • Very verbal • Retries upon encountering errors
DOWNSIDES • No playlist capability (but can be done in JavaScript!) • No photo-slideshow or video capability • Sound must be MP3 (flash limitation) • I'm sure there's more, but I can't really think of any other. But, hey, did I mention it's open-source? You can always change the code :)
License: (This program is licensed under the MIT License, which, to put it in non-legal terms, allows you to share, use and modify it. Even for commercial purposes. Check out the Wikipedia article on this license for more.)