Scalability Presentations on SlideShare

Slideshare is a good resource for information on scalability.  In particular there is a "webapps-scalability" group that has many relevant presentations.  For example:

Set Amazon's Servers on Fire

Scaling with Memcached

High Performance Web Sites 

Care and Feeding of Large Web Applications 

Scaling Twitter


In any event, I'd encourage those interesting in scalability to visit slideshare and peruse the many excellent presentations there.