Some good advice here:
  http://www.clarity.net/~adam/winter-storage.html  Personally - I'll be emptying the fuel system as well to change the filter (as well as draining the carb bowls) BUT
 I will be sticking my long-suffering Duke in a Vacc Bag.....  
http://www.vac-bags.co.uk/  Bringing Batteries indoors if your garage is not heated has been mentioned before as a good idea to reduce deposits from freezing. 
 Personally - I also bring my seats indoors as well (if I can get away with it) 
 
  Good luck - Frank