The following work and family safe link shows a program that claims to get you from 30-50 consecutive pushups to 100 pushups in 10 weeks.
I tried it and it worked for me. I went from about 50 chest-to-the floor pushups to 103 in 10 weeks.
I'm not saying it is the only way to improve your pushup numbers, but it did work for me.
Some days I did it as a warmup before the WOD, others days I did it after a ME workout, and sometimes I did it on rest days.
Thought I'd share for others.