Below are some links to sample .qdp files. Just go to the selected page, copy the data to your pasteboard, jump back to the Web-QDP page, paste the data into the text area, and finally click the "Create Plot" button.
spiral-- extremely simple data file
Example 1-- extensive use of labels
Example 2-- time dependence of several parameters
Example 3-- shows a model fit and residuals
Example 7-- a 2D image with overlaid contours