As expected, the large envelope was my wife's certificate for the star I had named after her.
It's very cool and came in a cardboard frame/card, with a sky map showing which star is named after her. I might go out buy a nice frame for the certificate. It also came with some astronomy software (which I'll probably get more use out of) and code she'll need for her free viewing of her star at SLOOH.
The information on downloading the Astronomy eBook still says it's for 2006. I went to the link printed on the sheet and as it turns out, it is for 2007. I guess they haven't printed a new download instruction sheet. I'm glad the eBook was updated though.
I told my son what it was, since he's sitting right next to me. He knows it's a secret, so hopefully he won't say anything to his Mom. :)
Addendum: I just noticed that they never fixed the registration date on the certificate. It still says January 1, 2006. AAAAAHHH! I just replied to the last email I received from them that said they would change it. I hope they can fix it and send me a new certificate with the correct date before Feb 14th.
Addendum #2: I already received a response! Man, that was fast. They apologized and said that the new date was in their database and the error was probably due to the certificate already being printed prior to the correct. They're sending a new printed certificate and they sent me a link to download a digital version to print out in case the new one doesn't arrive on time. Excellent customer service!