I browsed the forums but didn't see anyone mention it, so here's a plug from the source. The DarkBASIC book is out in stores now! To learn all about it browse to www.jharbour.com, and peruse the chapters, see some screenshots, or contact the authors. You can order the book from the following online sources:
Amazon US:
http://www.amazon.com/exec/obidos/tg/detail/-/1592000096/qid=1046324549/sr=8-1/ref=sr_8_1/103-2647427-1396656?v=glance&s=books&n=507846
Amazon UK:
http://www.amazon.co.uk/exec/obidos/ASIN/1592000096/ref=sr_aps_books_1_1/026-8742565-4071650
Amazon DE:
http://www.amazon.de/exec/obidos/ASIN/1592000096/qid=1046324405/sr=2-1/ref=sr_aps_prod_1_1/028-1081282-8594906
Amazon FR:
http://www.amazon.fr/exec/obidos/ASIN/1592000096/402-4173389-0837708
Regards,
Jonathan Harbour