Okay, neither can I, but I'm gonna darnit!
Over at 100 Push-ups.com they have a plan to get you to 100 in 6 weeks. Now I am not delusional enough to think that I can do 100 push-ups with 6 weeks of training regardless of what some well designed website says, but the plan seems sound. I am going to start with knee push-ups for 6 weeks and redo the program and move up to bench push-ups and then to floor push-ups. I have a goal of doing 10 real push-ups by the end of the year. I have just enough time to run through this program 3 times (knees, bench, floor) before then.
Other than impressing my friends at a party and making my husband feel inadequate, I can't think of any reason that I need to do 100 push-ups, but it would still be cool! LOL