My packing list is #14 in the FAQ of the Thorntree forum:
http://www.lonelyplanet.com/thorntree/thread.jspa?threadID=828622

I pack a clothes line made from braided surgical tubing - stretches and ties to a variety of objects, no pins needed because you tuck clothes into the braid. I use shampoo instead of packing laundry soap. In many areas you'll find places to have laundry done, though.

That is a LOT of ground to cover in 10 weeks! Good luck!

One more link - packing light will be really important since you'll be moving so fast:
www.onebag.com

Thanks heaps! I seem to get lost over at Thorntree haha.

And its been a great incite looking through your photos on Flickr, I hope to share some with you myself!

Don't worry about laundry. For a few dollars per load, you can get your laundry done almost anywhere. Check with hotel management -- if they can't do it, they will know someone who can. It can be done in a matter of hours if it's a sunny day (no dryers here).

I'd suggest carrying a small plastic bag of powdered laundry detergent. If you run out, it can be purchased in any grocery store.

You can wash some things in a sink and hang them to dry. I carry a few clothes pins. I used to carry a bit of rope, but never used it -- always managed to find a place to hang things.

More & more lower budget hotels/guesthouses have wifi now. If not, I've often seen cafes with wifi, some public libraries and parks in Mexico have wifi. I wouldn't do any banking on an open connection.

Lots of WiFi through out Mexico. Often for the price of a cup of coffee or at most 10 pesos per hour. Laundries everywhere at reasonable prices.