I'm always interested in what people write about their spouses and photography, especially when it comes to purchasing equipment. It really makes me wonder what percentage of photographers have to go through some sort of negotiation process in order make a purchase and how much of what I read is just light hearted fun.
I've been married for 27 years and during that time my wife and I have budgeted for an allowance for each of us (we each get the same amount). I use my allowance mostly for photography and computer related stuff. Sometimes I have to save for quite awhile to buy something (as is the case for the D700), but its worth it. This arrangement has worked well for us and I highly recommend it to others.