I purchased the Handy-Hooker. Easy to install and easy to use.
http://www.drdcorp.com/handy-hooker/kayak-canoe-storage/canoe-hanger.htm

: What are the options for hanging a sea kayak from a garage ceiling
: in such a way that the kayak can be raised up for out-of-the way
: storage but easily lowered when needed? Are there
: commercially-available devices for doing this?