For general sci/tech news nothing better than the good old Register, your tech news and reviews delivered with a sarcastic flare, just the way I like it.
http://www.theregister.co.uk/
For more serious reviews I always go to Tom's hardware, been following his site for years from when he first started doing reviews and talking hardware, now of course he is quite big and has an army of reviewers and testers etc to do the write ups. They can get quite technical, which is great if you like that sort of thing :)
http://www.tomshardware.com
Lastly for gadget news, reviews etc I just peruse Engadget who pretty much grab all the cool stories from around the world that you would be interested in. Of course they are owned by AOL now so take it with a pinch of salt, but gives you info on things you can research further on your own.
http://www.engadget.com/
This is not to say there are no other sites which would be just as good, these are just the ones I have used for years, if anyone else has good ones please share :)