It's funny, but David is what brought me to this website today. I was watching a SS video with my daughter and he was on it, and it got me to thinking "Hey, I wonder what happened to David!" I'm American but live in the UK now, and I grew up watching SS. Annoyingly, they don't show it over here now.
So, I've tried looking for videos and basically anything SS related that I can get my hands on, because I want my little girl to grow up with it too. For anyone in the UK interested in the video I mentioned, it's called
Sesame Street Early Learners: Singalong/Playalong Games and Songs (packaging says circa 1991, but the clips were from 1985)
and it features a lot of songs with David. I found it in a thrift shop for £1.00!