So cool. Just saw the latest Sun Microsystems home page.
Sun have just released their first in depth Oracle Coherence blue-print (white paper) documenting the architecture, performance and scalability impacts seen in a large application. As a comparison, the document outlines the performance and scalability of an application both with and without using Oracle Coherence. Apart from the performance numbers (which are obviously good), their independent tests demonstrate near perfect linear scalability to over 80 servers and a 40% resource reduction on the database. The numbers are very consistent.
The lesson here: Predictable Performance and Predictable Scalability beats plain old scalability, every time.