Just a little fyi, some ISO image can be bigger than the listed size of the CD. I'm not positive , but I believe it has to do with extra error correction info, and that sort of stuff. And just because the ISO is larger than 700 000 000 bytes, doesn't mean it's larger that 700mb. Last I checked, the 9.0rc1 ISO's all fall under 700mb.
Just in case you wondered :-)