There's been a slight change in Groundspeak's rules for adopting caches. First, Groundspeak will no longer process "forced" adoptions except in very unusual circumstances. They haven't really delineated what constitutes unusual, but assume that we will not be able to allow you to adopt someone's cache without permission. We can still try, but it is not likely to be approved. The only specific exception discussed involves the death of a cacher with permission of the family.
Second, we have been instructed NOT to unarchive caches to allow someone else to adopt them, even with permission. If you want someone to adopt your listings, I would suggest you post to the (IGO) forums to ask for volunteers. We can still unarchive if you archive by mistake, change your mind, etc., but not specifically for the purpose of adoption.
Of course, you can still do your own adoptions when both sides are agreeable at www.geocaching.com/adopt.
Thanks, WisKid, for letting me rip off your quote. Anyhoo, I also want to add that you can also use the above link to transfer ownership of travel bugs and trackable geocoins.