If you're a retailer running a home-grown e-commerce stack, your engineers will enjoy and benefit from Cal Henderson's "Building Scalable Web Sites".
Category Archives: orielly
Amusing: hacking Google analytics via Yahoo pipes.
If your own IT wizards are responsible for the care and feeding of your web app databases, I highly recommend this series of fascinating posts on database strategy put up by O'Reilly last spring. Tim O'Rielly interviewed prominent web sites on the nuts and bolts of their database approaches.