The Repairman Jack books and The Adversary Cycle books are inter-related and could be read in a certain order for continuity, if desired. The first in that series is The Tomb (Adversary Cycle, #2) which (as noted) is also the 2nd book in Wilson's Adversary Cycle. It is lighter and faster reading than the Dark Tower, but enjoyable. Paul Wilson's Repairman Jack series, and as you read along it becomes clear that Repairman Jack and others are fighting to defend against the end of the world as we know it. I have them on loan from the library, and have heard great things about the series.

I'm planning on reading Dan Simmons Hyperion very soon, along with the other 3 in the series. I really loved that book when I read it way back when and re-read it recently. Robert McCammon wrote a post-apocalyptic novel compared to The Stand called Swan Song. I found the road-map on the internet a few years ago and have updated the text a bit to correct typos and such. If you want a road-map and details of all the books with connections to the Dark Tower, just send me a message and I'll send it along. In fact it is listed as one of the many books that have connections to the Dark Tower series.

There's always the chance that the new live-action series will spur new interest in completing the Dark Tower saga in comic book form.I agree the Talisman is Tower-ish. The franchise rights have since shifted from Marvel to Simon & Schuster's imprint Gallery 13, but no further adaptations have been greenlit. Unfortunately, Marvel stopped at that point, never adapting the entire saga. Marvel continued to publish more Dark Tower miniseries after that, exploring more of Roland's hidden years leading up to the original Dark Tower novel and then adapting both The Gunslinger and The Drawing of the Three. That story culminates in The Dark Tower: The Battle of Jericho Hill, which chronicles the titular battle that destroys the kingdom of Gilead and sparks Roland's quest for the Dark Tower. That initial series was followed up by four more comic book miniseries that continue where the flashback leaves off and explore more of Roland's formative years. Basically an adaptation of the flashback portion of Wizard and Glass, The Gunslinger Born helps visualize a world that previously only existed in prose form and in a handful of painted illustrations. Marvel Comics first journeyed into this universe with 2007's The Dark Tower: The Gunslinger Born. Both the Dark Tower comics and the live-action movie are worth consuming as companions to the novels. The Dark Tower saga may be rooted in the prose world, but it's also expanded into other media in recent years.

The dark tower books in order