What are the best Rescue DVDs you use and what are the best programs on it you use , explain there usage ?

I always use

Hiren's Boot CD

The aptly named System Rescue CD is a linux-based rescue disk designed to troubleshoot Linux and Windows systems and servers. The disk is packed with tools to help you manage or repair partitions, back up your data or clone your drives in case of a failure, and supports a wealth of file systems (even network file systems like NFS) so you can work with just about any file on any drive anywhere. The disc also comes with replacement bootloaders, system file editors, network troubleshooting and diagnostic tools, and disc burning tools so you can burn while you use the disc. 

Thank you Hesham

The Trinity Rescue Kit

The Trinity Rescue Kit is a customized Linux distribution that's designed specifically for troubleshooting and reviving ailing systems, whether you're running Windows or Linux. It fits nicely on a CD (or a USB stick if you prefer) and once booted gives you tools to reset lost Windows passwords, scan hard drives for viruses and malware, clone drives, recover lost partitions, even open up the drives as network shares so you can get files off of them and to other computers on your network. It's completely free, although a donation to the developer behind it is always appreciated and keeps the project alive.

Hiren's BootCD

The Ultimate Boot CD

Knoppix

System Rescue CD