Available at DemConWatch So far she's kept to the script. Lot's of McCain attacks to come.
DemConWatch has other speech transcripts available also. Michelle Obama, Nancy Pelosi, Craig Robinson. More will be added as they happen.
Update: Note that the speech was a little different than the prepared remarks, especially the final comment about electing Obama and Biden at the end of the speech.
It starts:
I am honored to be here tonight. A proud mother. A proud Democrat. A proud American. And a proud supporter of Barack Obama.
and it ends:
That is our duty, to build that bright future, and to teach our children that in America there is no chasm too deep, no barrier too great - and no ceiling too high - for all who work hard, never back down, always keep going, have faith in God, in our country, and in each other.
Thank you so much. God bless America and Godspeed to you all.