iDVD is not, and has never been, available for download.
The current Apple thinking is that the entire world has access to fast broadband and wants to destribute home movies to friends and relatives via download (iCloud) rather than mailing them a DVD. The fact that nothing could be further from the truth has so far had no effect on this policy. If you scream and shout loudly enough down the phone Apple may send you a free copy of iDVD. That has worked for some, but is not guaranteed to work for all.
Whilst Macs with a Superdrive continue to be able to burn video DVDs, the software for so doing, iDVD, is no longer included in the iLife bundle that comes with Lion. You have to buy iLife 11 from online Apple Store in order to get iDVD. You are strongly recommended to do so soon as it will not be available for much longer. I currently run a G5 PPC Mac but have already purchased iLife 11 (which will only run on Intel Macs) to be ready for the day I update to an Intel iMac. Which will be when, and only if, Lion has been superceded by a sensible operating system that allows the user to choose what applications to use, and how, and does not dictate how I destribute family videos or photos to distant relatives and friends, and does not assume that every user is prepared to pay for the excessive bandwidth usage charged by ISPs for huge downloads from the App Store.
