A great wealth of information I just stumbled upon given by Dan Bornstein, one of the creators of the Dalvik VM. It’s a long watch - but it definitely helps explain some things that are better than anything I could do;
The slides for further review and handouts can also be found here; http://sites.google.com/site/io/dalvik-vm-internals
Coming up soon I will have the patched dex file and the tutorial to go along with it!