Retrieving accidentally deleted digital photos from memory card (user error)

It's no problem at all to get deleted photos and videos back. Please see this post for several free software options that you can download:

http://camerarepair.blogspot.com/2007/12/recovering-those-accidentally-lost.html

Your problem is one of the most common issues that occur with the digital camera users. Still it can be solved. You have not mentioned that which operating system you uses. No Problem! There is a software named Photo Recovery Software which is capable to recover photos, pictures from almost all kind of memory cards and can work on both the Mac and Windows based computers.