How do I Winter-proof my bike?

[Slaninar]

Thanks for the tips guys. Keep em coming. 
I have a X reg FZS600. Only had it for about 4 months. My first big bike. It has the standard exhaust manifold which Ive heard will rot pretty rapidly so next time the weathers good I plan to take it off and give it afew coats of fire grate paint. I use the bike to commute about 30 miles per day and short of heavy snow nothing will stop me using it for this. I save around £7 per day not having to buy a parking ticket and of course get better mpg than my car also.
The bolt heads through the brake discs are starting to rust. Can i grease these to prevent further corrosion?

It would be cheapest in the long run to just get a beater winter bike. Some cheap 2 stroke scooter, or something bigger if you must - but lighter, smaller than 600 cc.