AndrewC: CAPTCHA's are the most proficient means of dealing with spam.
With automated spam, sure, captcha might work great, but this is no automated spam... the devs looked into the recent spam situations we had here, and this is just few folks from China doing copy-paste, topic after topic, until they get bored. So yeah, I'm sure they can solve captchas too :).
Anyway, guys, the devs are currently working on this and it's one of their top priorities. Soon you will see a new "mark as spam" option, that will appear once you downrank a post. This, with some other algorithms to detect and throttle spamming, will make the life on this forum very very hard for spammers and their spam while not affecting normal users. Please bear with us as the system is put in place. I will ask devs to update you about this in the next few days.
In the meantime I'd like to thank everyone who downrated such spam posts and therefore made the forums cleaner for others. We really appreciate this!
PS: as for captcha/drm analogy - what Venom was saying is that forcing captcha by default on every users to make life harder for one spammer is just as stupid as forcing DRM on all customers to make life harder for few pirates, that's it.