I haven't quite gotten into the storing images in every manner possible syndrome

... yet. But I feel kind of uneasy about relying on only 2 DVDs. One disc goes bad and then the duplicate gets a scratch and.... you may want to give serious consideration to an alternate storage method, even though my gawd that is an awful lot of data to store somewhere the other way to look at it is my gawd that is like losing a lifetime of work if things go wrong for you.
As to the topic, around 5500 images (actually kept) and 16GB of data using Raid 5 (4 drives) as well as copies on my workstation and a good portion of them being on SmugMug. With my server going to Raid 5 over 5 drives soon, the current drives are 60GB IDE drives and with drives being so cheap it will be 500GB SATA2 drives in the array. The sad thing was the 500GB drives were not much more expensive than the 80 or 160GB drives.
Oh memories of 500MB drives being a dollar a MB and now we suffer at 10c a GB