[kawsper]

> It also tracks the profile of your application, and applies a scheduling algorithm based on what it has learned. For eg. the url /import may take 170MB and 800ms to run, on average, so it would schedule it with an instance that has more resources available.

That is very awesome technology, but it something like that available for non-google people?

[nikcub]

Expensive commercial appliances like the popular f5 big ip's can, and that is what a lot of large-scale websites use:

http://www.f5.com/glossary/load-balancer/

In terms of open source, HAProxy has layer 7 algorithms but they are much simpler:

http://cbonte.github.com/haproxy-dconv/configuration-1.5.htm...

If you were inclined, you could write an algorithm to implement something similar in one of the open source routers.