TELECOM TRAINING (ON PREM/ENTERPRISE PHONE SYSTEMS):
The Avaya Engineer, a blog that focuses on Avaya Red enterprise systems with helpful hints on getting by on the said system.
PBXHowTos, is focused on mostly Avaya Red enterprise systems as well. A former Tier 3 support crew once based in Colorado, "CJ" has given people basic video tutorials on how to set up extensions, trunks etc on the Avaya Red systems
The Nortel Guy on YouTube, and he can train you in a crash course setting on Norstars and the large Meridian 1/Cs1000 systems.
Eli the Computer Guy, this oddball of a guy can actually give you some great crash course on telephony believe it or not. I recommend it because I feel his lessons are right on for that level for the IT types.