The web is definitely moving toward a more interactive and real-time experience. I recently stumbled upon this website for Rafael Viñoly Architects. The home page features a hand doing a sketch for an Architectural drawing. Every time you visit the page, something different is being drawn. I think this gives an inside glimpse into their process, and is very interesting for a customer or potential customer to see.
Personally though, I find moving elements on the page to be distracting, even though I can understand why they can be useful.
What do you think?