Preserving Garlic questions

Hello all garlic freaks.  I have a few questions about preserving garlic.

One, Is there anything else to making garlic powder other than drying and grinding?  I made it once a long time ago and it hardened into a clump.  Was is not dry enough?  Do I need to add something inert to keep it from binding?  Whaddup wit dat?

Two, has anyone ever heard of the shelf life of packing whole fresh cloves into olive oil? 

I have pickled garlic cloves and scapes before but am interested to hear other ways of preserving.

......and........go!