Do you know of any websites/ videos that provide good at-home workouts? I have seen a lot of commercials for DVDs and products, but I wanted to see if anyone has used any? 

I purchased the Turbo Jam dvds.  They provide a fantasic workout.  You can adjust the impact based on you own level.  I love them...when I do them.  It's a whole other thing to actually motivate to exercise at the end or the beginning of a long day.

I love the Tai Bo tapes.  Billy Blanks kicks my butt every time!  They are a hard workout, but I swear that I feel stronger after just one run-through!

My girlfriends love the Billy Blanks DVDs!  Seriously good work out, I don't have them myself, but I think I might look into it too!

I agree that the turbo Jam workouts are amazing!  I posted a home workout topic, not knowing you had one here!  LOL  It's one of my favorites, and really works!  Good luck, and I will be checking back to see if anyone has any more suggestions.  Have any of you tried the Bosu ball?  I really like that too, great workout!