Scrumming warm up drills:
http://www.youtube.com/watch?v=wS-xlNEab-w&feature=relmfu---
Drive from line out:
http://www.youtube.com/watch?v=MYn69kL60Uk&feature=relmfu
Drill for strengthening line out lifters:
http://www.youtube.com/watch?feature=fvwp&v=X0tlcbcTEFE&NR=1
Ruck and maul:
http://www.youtube.com/watch?v=sTsbiJdea6w
Moving ruck support, good conditioning:
http://www.youtube.com/watch?v=Y46h_9V5T3M&feature=related