What a fun--and potentially frustrating--topic! That It's a Living opening brings back memories.
I haven't gotten around to rewatching it yet, but I was excited to find that The Critic is free to stream on Crackle.
The Days and Nights of Molly Dodd and Homefront have already been mentioned, but I'd also love to see Brooklyn Bridge, I'll Fly Away, and Remember WENN again. The latter was AMC's first scripted show IIRC, and was pretty low-budget but was so clever and well-made. I'm still mad that it was canceled after ending on a cliffhanger.