DVDRam is mainly used for storing information and is similar to a hard drive, in other words a file can be put anywhere that there is an empty space, or spread over a disk...they are not 'linear' like a normal DVD -/+ disk.
DVDRam disks can also hold more than 4.7gig of data (9.4 gig is max I think).
They have a rewrite life of over 100,000 rewrites (far more than any other DVD RW format).
They have a 'working life' of 30 years.
They are designed more for data but are very good at video, with the other formats being designed more for video but good at data, but not if the data changes.
Like HD's they do not need 'lead ins' and lead outs or 'finalizing'.
They are bootable.
DVD-Recorders (the standalone TV ones) sometimes use DVDRam as their media. So if you have a RAM standalone you can save some headaches if you can play the media in your DVDWiter to transfer to the HD for editing.
DVDRam is not a 'dead' format' a lot of the LG range ofDVDWriters are triple format (+, - and DVDRAM). Its just that the other formats (and lets be HONEST) are good at making playable DVD-Video disks that play on standalones.
From the above it might sound like I'm a DVDRam fan, well I dont ever use it as I am to busy 'backing up' 'files' to the other DVD formats (via DVDShrink) to be bothered about it..........