@michaeldenis, Thanks@ It's good to see you around too. I need to get back into shooting new material.
As far as a tutorial, the closest thing that comes to mind is Josh Harle's web log entry here:
Also, feel free to ask the crowd over at Ólafur Haraldsson's http://pgrammetry.com/forum/ for pointers.
Be aware that to perform dense reconstruction of great detail or a large area (covered by hundreds of photos, that is - 20 photos from the air of a large area/object naturally won't pose a problem), you'll need a 64-bit operating system to support a large amount of RAM and you will, of course, also need the large amount of RAM. The alternative to using all the cameras at once in PMVS2 is to split them into smaller groups via CMVS, but so far CMVS only works with Bundler output, rather than Photosynth output and even Josh and Henri's toolkits which simplify Bundler usage considerable have yet to succeed for me.