Overall - I like to watch GCN, also I'm subscribed to GCN+ which is sometimes interesting to watch. Also David Arthur, sometimes.
Training and nutrition side of things - Dylan Johnson , and also I tend to look at talks and so on by Stephen Seiler; although his presentation can be a bit slow, he's got a ton of interesting things to say.
Bike fitting advice - Bike Fit Adviser, and also Francis Cade's "Bike fit Tuesdays".
Technical stuff about CF bikes - Luescher Teknik
I have a problem with my bottom bracket / bearings and need an idea to fix it - Hambini, aged 5. Would be way better if he wasn't a ****-talking knobhead, but if you have a BB which doesn't spin freely, he is your guy.