Congrats on the bodyfat drop Kim; that's awesome!
As I said, I am only going off the results of two people. That's wonderful that so many people have found success using it.
However, I think Crossfit is actually perfect for someone who is untrained and just starting out. Reasons being:
1) Scaling-they are big on scaling the workouts to your fitness level or ability. They go step by step on how to scale for certain levels of fitness. Beginner, intermediate or advanced, it's for everyone.
2) Focus on technique-this is one of the biggest reasons I think beginners should go to Crossfit. You learn proper exercise technique right off the bat. This will save years (literally) of time and effort. See all the people in the gym doing half benches, doing crunches and muscling up cleans (if you even see anyone doing cleans in a commercial gym)? Dollars to dohnuts they aren't superfit/ripped/powerful people. Technique is everything.
3) Fitness-the focus on all areas of fitness make it ideal in terms of dropping fat, gaining functional strength, and having phenomenal cardiovascular fitness. Looking for longevity in your life? Crossfit is the answer (at least in my opinion).
4) Exercise selection-no useless exercises here. You won't find cables, pec decs, etc... . All exercises serve a purpose. The focus is on increasing your functional ability. Squats, deadlifts, cleans, pullups, sit ups, etc...; all functional and all amazing compound movements. Only the best. And the exercises can be learned. You aren't the first and won't be the last person who doesn't know the exercises. Just study them, get your form down, and then get to work (if you can get Mark Rippetoe's book 'Starting Strength' the Bible of exercise technique).
5) No wasted effort-The workouts are quick, intense and furious. You're not wasting valuable effort where you don't have to. The warm up, than the workout.
6) Can be done at home-you don't absolutely need to have access to the gym. The bodyweight workouts are great. Is it an ideal situation? Nope. However is it better than most other alternatives? I would say yes.
7) Support group-it's like a big family. Everyone helps each other out. Have a question? Ask it in the forums. You will get a lot of useful answers. I ask lots of questions (actually more than lots) and am given thought out, and very useful answers each time. Crossfitters are some of the nicest people I have ever met, with no hidden agenda. They (we) are around to help in any manner we can.
8) They love the Zone <img src='desktopmodules/ntforums/images/emoticons/smile.gif' height='20' width='20' border='0' title='Smile' align='absmiddle'>
I could put more but I don't want to sound like a shill. Does P90X work? I'm sure it does. Does 5/3/1/ work? Yip. Does Power To The People work? Not sure actually (but that is what I am going to be doing next; it sounds like fun). Does Crossfit work? One hundred thousand percent yes; when you are able to give it the intensity it calls for will you hurt? Yip. Will you want to give up? Most definitely. Will you see results faster than you imagined? I would not be surprised (look at the testimonials forum; amazing stuff). I only wish I started with Crossfit when I first began training. I would have saved years of effort (at times useless) and LOTS of injuries.
And the good thing is you don't have to have crazy intensity right off the bat. You scale to what you are able to do and will soon be doing the workouts as Rx'd. To start I would pick some of the bodyweight only workouts and get yourself used to resistance exewrcise first (good point Kim). Don't worry to much about your time, or distance, etc...; just scale to what you feel your abilities are (i.e.-says run 5 K for time. Scale it to run 1 or 2 K for time; even jog it or trot it). Here is a link to the bodyweight workouts. It is in the first post by Shane Skowron: http://www.board.crossfit.com/showt...hp?t=38312
Anyway I have rambled on long enough. Sorry about that. Good luck with everything.