Ooops, so sorry to hear this! But there is hope.
In all likelihood you will be able to recover some or all of the lost images with digital photo and recovery software. There are many such programs available which recover data from memory cards such as CompactFlash, SmartMedia, Memory Stick, MultiMediaCard, Secure Digital card and IBM Microdrive.
We have detailed information and a tutorial on image recovery here:
http://www.digicamhelp.com/digital-photo-recovery-and-rescue/index.htmHope you get them all!