Bummer. The Delete item should bring up an "Are you sure" dialog before deleting (at least for folders). For your data, if you have Norton Utilities, TechTool or similar, run the Trash back or similarly named tool to see if you can recover some files. In general when you accidentally delete something you should leave your computer alone as the data is still on the drive as long as another file hasn't overwritten it yet. Backing up is a good thing.