Strength Training w/o Equipment

I was wondering if anyone had any links to some good strength training work outs that don't require a whole lot of equipment? I have resistance bands and a yoga mat. At some point I want to invest in some weights but they're so expensive. In the meantime, I do basic lunges, push-ups, crunches, yoga, etc. but I'm looking to mix things up. Any advice is appreciated!

try out a Jillian Michaels dvd she incorporates strengh with cardio. Sounds like what your doing though is great! Remember weight is weight if you dont have 'real' weights open your pantry grab some can goods 16oz is a pound!!

I host a bootcamp fundraiser for the moms on my son's football team. Here is the weekend workout I sent to them.

COMPLETE 20 seconds OF FIRST EXERCISE, 10 seconds REST

squats w/dumbbells
side shoulder raises
repeat for 4sets

push ups
basic crunch
repeat 4 sets

front knee raises
overhead press
repeat 4 sets

stationary curtsy lunge
front shoulder raise
repeat 4 sets

seated row
calf raises
repeat 4sets

Plank holds
walk the plank-start in your plank position, (beginner) begin pushing hips back toward your hips walking hands toward your knees. (int/advanced) walk hands back toward hips as you push your hips toward the ceiling keeping both legs as straight as possible and push your bodyweight toward your heels into an inverted (^) pike position. BOTH LEVELS: walk hands out to return to your starting position.