Allows inlcusion of RSS feeds, external html etc from any source in any format, and optionally transforms the feed via XSLT.
The plugin requires a cache directory somewhere below the wordpress installation folder, with world read/write acces (mode 777). Point the plugin at it via the options page within WP admin panel, using a relative path from the wordpress folder. So, for example, my options page has a 'Cache path' setting of 'wp-content/cache'. You might consider giving this a random name for security purposes, like 'wp-content/cache-n38Q'. Up to you really.
The XSLT functions used require some form of PHP XSL extension. PHP 5's XSL extension is what I've been exclusively testing with. According to the PHP manual, PHP 5 includes the XSL extension by default. Some old and probably broken PHP 4 fallbacks are still in this module's code, but it has remained untested for over a year. I have no way to test it. I'm considering just flat-out saying 'PHP 5 required'.