... but ... what exactly is a "soaker"?
Soak some ingredients in water for a while and you've got a soaker.
Typically folks use a soaker for softening whole or cracked grains. Soaking whole grain flour overnight is also commonly done to softening the bran up and start the enzymatic process.
Paul and Michael do a better job describing the advantages of soakers on this thread than I can do at the moment.
Excellent. I was trying to search for a thread like the one you linked to there, but you know what they say about trees and the wood.... Cheers!