... they do not want you to know this but... you can extend the life of your Cricut mats with a little soap and water! Mat has lost its stickiness? Paper slides around? Use a little soap and warm water and gently wash your mat and let it air dry. Do not dry with a towel or you will add lint and dust to your clean mat. Once dry, you are back in business.
Many cricut users like to use baby wipes to "clean" their mats but I find that there is a chance of residue or moisture messing up the next paper I put on the mat. I like to use a lint roller...yes a lint roller...to clean my mats. Easy, no mess no fuss and you will be amazed at how much "lint" you will get off your mats.
Remember to flip your mat around...use either end to feed into the Cricut first. And the simplest tip of all...keep the cat away from your Cricut mats...no seriously, make sure that you keep the clear cover clean and free from hair and lint and replace as soon as you are finished with the mat.
Well...each CD contains 8-12 presentations (depending on the class) and each presentation is 10-12 minutes long. Each presentation is also printable as well as a shortcut two page printable version so you can take it with you. I hope that helps. If you look at my Free Class here you will get an idea of what my presentations are like. Look for future Classes to Go each one dealing with a cartridge and projects.