The app goes beyond searching your garbage pail. This is meant for users who have already emptied their trash, and need to access that data from the file system. If you haven't used some sort of data-shredding app, chances are good that the deleted files are still recoverable.
Available in Basic (free), Pro (US$89), Expert ($169) and Enterprise ($299), Disk Drill offers a range of products that ramps up in ability from simple scanning (without file recovery), all the way up to a full site license with forensic data investigation.
Disk Drill scans your drive, offers a list of recoverable files and lets you preview and retrieve them. A company spokesperson told me that, "if recovery is done fast and right, data recovered is between 70-100 percent of the lost amounts." The app uses a variety of retrieval methods that range from simple scanning to "Deep Scan."
A new HFS+ catalog option, new to Disk Drill 2.0, can also recover the structure of a partition that was lost to hardware or system drive error.
To learn more about updated features, check out the 2.0 release notes.