Can you stop cursing yourself if you accidently delete all the great pics you took on your vacation from the Memory Stick, here is the Memory Stick Data Rescue service to help you out. This service enables you to recover those precious photography and data files, which were once stored on a Memory stick have been lost or deleted. This file retrieving software is available as a free download. If you wish to use this service, you first have to register the Memory Stick model and serial number to begin download of the recovery software. This software can recover jpg (DCF format), MPEG1 and .mp4 (MS Video File Format) files and in addition, is also capable of restoring most office data files including Powerpoint and Word documents.

So once you plug in the memory stick, the software guides you thru the 7 straight forward steps helping to verify, recover and resave them. If you think compatibility will be an issue, then you are wrong as this software will help you retrieve your data from any Sony Memory Stick, which were sold since 1998. But A Word of Caution, the success of file recovery depends upon the state of the data and whether or not it has been overwritten.
The tool can be downloaded here.