Ganoksin: fantastic niche forum focused on jewellery making and metalworking. Great community for nerds into that shit and web 2.0-ish forums
The HVAC man: Adorably DIY website with actual great HVAC advice. Total recommend if ever working with air or piping systems
Hacker news: The staple nerd forum
Ben Einstein blog: Dude who has solid hardware product startup takes
Lucidity: Some dude's blog giving hilarious no-bullshit commentary on corperate workings