Gear Diary has great writers and really thorough reviews of gadgets and lots more cool stuff
The Boy Genius Report gets lots of scoops on upcoming phone models / release dates etc.
Lifehacker - as the name would suggest - is great for not just gadget tips / ticks / hacks - but also general ones - super cool site
TUAW is great for iPhone and general Apple / Mac articles
And of course, my iPhone site is roughly 147 times better than all of those combined