Skyrider--I found this little "yacht" available for Nile cruise:
http://mychristina.net/

There's a Cairo guide expat named Debbie and she mentions it in Frommers:
http://www.frommers.com/community/forum.cf...ryCurrentPage=0

I would personally consider renting her for a few hours AND invite the local expats to bring the party if I could co-ordinate it last-minute. Just a thought in case you had a really special occasion to celebrate.

Looks like we'll either use Debbie (Casual Cairo) or a fellow named Abdo, who has been corresponding with me about touring and rates:
abdo_eljoker@yahoo.com
I am working the airline angle for future repeat business and good rates from him. He's actually from the oasis, Fayoum, and I have always wanted to go!
It's not far past Giza and Sakkara.

Hope that's a bit toa dd to your research.