"Interestingly, three people reported over half of the errors. So a big thank you to Mushfiq Mammadov, Elena Felder and Cedric Georges. I’d also like to thank Roel De Nijs. He didn’t report many errors, but he *confirmed* a whole boatload of them. Which saved me a lot of time and I really appreciate."
Anybody finds an error you should paypal 'em some root of all evil to get more readers involved in it. Finders fee. Good motivation on both ends! One time I found an error in some book and called the publisher on the telephone and he promised to send me a free copy of the next edition.
In the front of your book you could give a link to an errata sheet, in case the purchaser doesn't know one is being maintained. When an errata sheet is available I like to go down the list and mark corrections in the book.
Then YOU must do the pig's work! Read this tiny ad. READ IT!