Re: Moving on after Co-sleeping
My parents always kept a crib mattress under their bed and would pull it out if one of us was sick or something. If you don't have room for a full bed in your room, you could even have a mattress on the floor for him to transition to and keep it under your bed during the day.
Also, I haven't read it (I'm still preggo with my first), but I've heard the book, "The No Cry Sleep Solution" is great. There's even a version for toddlers.