You copy-paste your number series and the application displays a column chart of both the occurences of the first digit and the theoretical occurencies expected.
Use it and tell me what you think. Many thanks to Vaggelis Tripolitakis for finding the first bug. Be gentle with it as it runs as a free Google App Engine service. Depending on my free time and feedback I get, I may add the rest of the tests that Nigrini describes (second digit, last digit and first two digit distributions) and make it better looking.
If you like it very much, you can buy me the kindle edition of the second edition of Nigrini's book.