More than once, I joked that 3rd edition GURPS had more published supplements than Talisman. And let's face it, 3e GURPS had a shmupload of worldbooks, with occasional supplements in between on how to handle different genres and settings in more general terms
But these days, it's a while between publication of hardbound books for Steve Jackson Games' flagship system, as the team is normally publishing either a) PDFs of smaller GURPS supplements or b) Munchkin expansions. They've chosen to reserve the physical production for those general genre books, the ones that would have narrowly escaped between the previous generation's worldbooks, and it shows in their presentation. The latest, GURPS Low-Tech, is out now, and I wish it had arrived sooner.