I bought 2 new steel bikes from my LBS, and they also care for my 10 year old steel bike. (that's 3 steel bikes in my house) They stay in my house where it is warm and dry. I ride them in the wet (it's Seattle!) and even though I never took particular care of my steel bikes when I was a young 'un, I wanted to be sure to take good care of my bikes now.

For the new bikes: LBS said not to worry about framsaver until I replace the bottom-brackets, then they'll coat the innerds for me, but it's not crucial. My bike guru said the newer steel frames with the nifty new paints are quite a bit more resistant to rust and storing the bike indoors does more than framesaver alone ever would anyway. Oh, and keep those drain holes clear!

For the old bike: yup, I should framesaver it, but again they aren't in any hurry and it can wait until I replace the bb.

The overall impression I got was that storing your bike indoors was the best thing to do for a steel frame.