You want to insert your 3D model into a webpage - you don't want to use pre rendered GIF sequences or plug-ins visitors have to download? Say "Hello" to X3DOM. They just released the 1.2 version which takes the current HTML5 web development into consideration such as CSS3, webfonts, Flash, and WebGL. Greatly this makes it also usable with Blender 2.5x. It uses the canvas tag, and allows to use textures, which can be animated, lights, mouse interaction, collision detection and other interactions.
Blender Support: http://www.x3dom.org/?page_id=1101
Converting Blender scenes into x3dom webpages is pretty simple: Blender already supports direct X3D export even so there are some issues (Don Brutzman wrote about). Blender Version 2.4 seams to export some more nodes (e.g. lights), but in general it works. We will explore this more in the future, but an exported X3D file (such as the little horse shown below) may afterwards be easily be integrated into an HTML webpage using x3dom.