This is an old topic.
 
SEARCH BEE-L TWO QUEEN MANAGEMENT
 
will return the first 100 hits, which can be retrieved if they interest
you.
 
Recommended reading:
   _The_Hive_and_the_Honey_Bee_ contains a little bit, but not much.
   _The_Sky_Scraper_Hive_ (author unknown, recommended on BEE-L)
   _Swarming:_It's_Control_and_Prevention_ by L.E. Snelgrove
 
Personal Experience:
   Lots of work for huge harvests.  Done right you will reap great
benefits.  It's easy to go wrong.  The techniques maximize populations
hence the desire for your bees to swarm.  You'll end up with hives that
are easily 15 feet high, lots of heavy above the head lifting and
dangerous ladder antics.  I personally feel that the extra work far
outweighs the extra honey, but I will try Snelgrove's technique in '98
because you can split off one of the queenright bodies at any time in
the process, so if the hives get too high you just split part of them.
 
Two queen hives are not for the feint of heart, only work in certain
areas - those with short but intense flows, are a LOT of extra work
and I'd only recommend them for the learning experience where you'll
probably learn that you'd rather not run a two queen hive.  However,
if someone gave me that advice before I tried it myself, I'd
have tried it myself!
 
Good luck,
Aaron Morris