SMIL - Synchronized Multimedia Integration Language

The Synchronized Multimedia Integration Language (SMIL, pronounced "smile") enables simple authoring of interactive audiovisual presentations. SMIL is typically used for "rich media"/multimedia presentations which integrate streaming audio and video with images, text or any other media type. SMIL is an easy-to-learn HTML-like language, and many SMIL presentations are written using a simple text-editor.
SMIL 1.0 is friendly and easy. You will not find the extra power of SMIL 2.0 but you will find more tools and an established track record of support. It is well supported by RealPlayer and QuickTime.