Starting off with helping out a fansite (Emma Watson Empire) to being the founder of knightbus.org, - a site which lists Harry Potter related sites and where DanielJRadcliffe.tk is listed also - and his organisation called 'The international network of Harry Potter Websites' his way to keep Harry Potter and it's fandom alive.
A small scan about setting up knightbus.org:
Interested? You can buy the book via the following links:
- ISBN-10: 3849123502
- ISBN-13: 978-3849123505
- 184 pages
You can view a video here. For more information about Thomas Sailer or this book, you can visit his Facebook page or his website.