I also got my 770 a few days ago and my Kingston 2 gb card just arrived today. I'm following the instructions on http://www.examplified.net/guide/Nok...oting_from_MMC
and everything was going smoothly until step 7

sudo gainroot
cd /home/user/MyDocs/.documents/

I keep getting the reply
can't cd to /home/user/MyDocs/.documents/
and so I'm stuck. Does anyone have any suggestions?

--------------- edit ---------------------

My problem was the "D" in MyDocs. I was typing "Mydocs" instead of "MyDocs"
It took 39 minutes to copy to the card.
Now it boots from the card!!!