My first 2 kids are 10 years apart... sometimes I wish they were closer, but I was only 16 when I had my daughter and was in no way ready for another that early! Sometimes though, its nice to have such a HUGE helper! And she was fairly independent while I was on bedrest with him which made things SO much easier... she could even help me a little when I needed it.
Now my daughter just turned 12, my son is going to be 2 in January, and our 3rd is due March 3, 2010.... I'm pretty excited that my son will have a brother his age, but a little nervous about having 2 little ones to chase after and take care of at once... especially since my son is such a momma's boy! LOL! Not to mention getting my daughter to all of her activities like Girl Scouts, etc... and having time to still make her feel important... sometimes I can tell she feels like the little ones take away some of her attention, especially since she was the ONLY child for SO long! I know it will all work out though, and everything will be great!
Anyway... Honestly, I really don't think there is any "perfect spacing" of kids... I think no matter when you have them it just works out for you! Good Luck!
My kids are going to be 17 months apart..im due in june..i dont think its going to be anything different tehn now..maby a lil harder but i cant wait!! :)