Here is a small wip tutorial on the wiki about "Geometry Batching" using VerexData & HardwareBuffers.
Experimenting with HardwareBuffers and VertexData I found out that there is not much code sample demonstrating simple usage of vertex & hardware buffer manipulation.
And although the manual documentation is good I had difficulties to grasp the sequence needed to use
This tutorial is mostly a working code which shows how to send a simple cube to the hardware buffer. No texture, no colors to make the code as simple as possible but with a code that is still easily extensible.
Note that the code is a rip-off of the PagedGeometry Engine from JohnJ. To which I am indebted because without his code I wouldn't have been able to understand geometry batching

Any help to add to this tutorial is welcome and hopefully it will be promoted to an 'official' advanced tutorial

Regards
Steven