Just started today after doing a week of P90.  P90 was a little boring with just the 2 different workouts alternating every other day but it was a good thing as I don't think I could have handled this right off the bat.
Starting at 6'0 225...chest and abs are on fire already.  Thought I was going to vomit about 3/4 of the way through.
Oktoberfest in 2 weeks so I may stray from the nutrition plan a few times.
		
		
	 
Talk to me about p90.  I want to start this and am just too old and out of shape to jump into p90x.  Do you need anything besides a dvd player?  how hard is it starting out?  How long are the exercises.  There are so many power 90 products which is the real thing?And Broadwa G, Keep it up.  I like reading your posts.  I'm with  you I could never do pull-ups even when I was in my prime.
		
 
		
	 
P90 is the most basic of Horton's programs, he made it about 9 years ago.It is essentially four workouts broken down into two six week sessions.  The workouts are: Sculpt 1/2, Sweat 1/2, Sculpt 3/4 & Sweat 3/4.  Sculpt is based on resistance and Sweat on cardio.  There is also the Ab Ripper 100 & 200 which are 5-7 minute ab routines you do after the Sweat workouts.
During the first six weeks you alternate between Sculpt 1/2 & Sweat 1/2 every other day, six days/week.  The only required equipment is either some light dumbbells or a set of resistance bands.  You can pretty much use any cheap resistance band you find at Big 5.
For the second six weeks you stop with 1/2 and switch to 3/4 which are essentially the same programs but slightly extended and slightly more complex.
IIRC the workouts are about 30-45 minutes each.
If you think you are starting out at the bottom physically, this is definitely the place to begin.  You should find the workout to be challenging but not daunting and after the 12 weeks you will notice a difference.
Personally I would suggest that you not try to change your eating habits significantly during these 12 weeks.  Just focus on getting in the workout each day.  Mentally condition yourself over this time that no matter what else happens in your life at least you got your workout in.  If you have a horrible eating day, or a bad day at work, or your girlfriend left you or your dog died it sucks but 
just get the workout in.  It becomes a source of pride and something that you want to hold onto.  After three months of this the workout should be a habit and missing a day will start to concern you.  At this point is when I would suggest you seriously try to tackle improving your eating habits.
Back to the workout: After P90 Horton made P90X (which has been spoken of enough in here) however a shortly after P90X Horton made P90M (Masters series).  P90M encompasses much (most perhaps) of P90X but Horton removed the pull ups from the program.  I think for many people the pull ups become discouraging and derailed them from completing P90X.  If, after you finish P90, you think you still want some additional conditioning before proceeding to P90X I strongly encourage P90M.  It consists of six different workouts: Sculpt 5/6, Sweat 5/6 (much different then 1/2 & 3/4) Cardio Intervals, Core Cardio, Plyo Legs & Upper, Middle, Lower and the schedule of workouts changes throughout the 12 weeks.  The workouts are definitely challenging and rewarding.  P90M is not only a great stepping stone between P90M & P90X but it is just a darn good program in its own right.
P90M workouts run between 38-54 minutes and only require either dumbbells or resistance bands (only for Sculpt 5/6).
You may also want to invest in a good yoga mat as you end up on the ground a bit with the stretching and some of the exercises.
One good thing about starting where you are Chumley is that you have 12 months of workouts pre planned for you.  You read in this thread about a lot of people asking what they should do after they finish P90X and there is really not much of a consensus.  But starting at the ground floor you have four separate 3 month programs available to you that you can stack on top of each other, progressing from one achievement to the next. P90, P90M, P90X & P90X+ is a full year of workouts there for the taking.  I guarantee you beyond a shadow of doubt that if you make it through those four you will be light years ahead of what you think is being in good shape.
And remember that nothing tastes as good as skinny feels...except beer but what are ya gonna do?