I have 4years and 2 months between my two. We were originally aiming for a three year gap (But nature had other ideas) as my bro and i are just under 4 years apart and as we got a bit older we went seperate ways for a while and only kinda got back on track once our own kids started coming.
The thing I think was most difficult was DS#1 adjusting after such a long time of having both of us to himself. So we did our best to pay extra attenetion to him and not focus ALL our energies on DS#2. It is good when DS#1 is at pre school as I have undevoted time for DS#2 as i did with DS#1 and I will also be able to go to kindy gym and swimming etc with just him so that will still be our special times together.

In saying that, I think that whenever you feel is the right time to go for it.The timing needs to fit in with your work, family and other major influences i your life.

Good Luck Emz.....and don't go giving me a heart attack like that again...i was ready to start checking the pg announcements!!