Hush Hush, the Sleepers' sourcebook for Unknown Armies, is available for sale now at e23. The printed book is also available from all the usual sources, such as Warehouse 23.
This will be the last new PDF for sale from Atlas Games in 2010, since e23 is closing down for the holidays and won't be processing any new files. Come January, you can expect to see more books newly available for sale as PDFs, however! Keep an eye on this space for news when they are available.