If you subscribe to both, you WILL get double
posts. Or more precisely, you'll get double
posts of everything the moderator deems as
being on-topic and single posts of everything
the moderator deams as off-topic.
Of course, if one auto-archive the ccTech list, then they get (in theory) a good archive
of all of the topical information. Interactive reading is done on the ccTalk list.
This technique works good for me, especially if a period of time elapses where I dont have
the time to view and make manual decisions on all of the posts...