Lets you easily embed Amazon products into your posts by use of [asa]ASIN[/asa] tags. Supports the use of templates.
There is a special built-in template for mp3 files. Use [asa mp3]ASIN[/asa]
Unfortunately the Amazon webservice does not support Kindle prices at the moment. See https://forums.aws.amazon.com/thread.jspa?messageID=208072
There are two very similarly named PHP extensions, dom and dom_xml - the dom extension is built into php5 and loading the dom_xml extension (designed for php4) will override the default extension. I suspect that loading php_domxml.dll (on Windows) in your php.ini is the cause of this problem. Try to disable it and see if that helps.