Most of the time you simply run a search on a specific product and find articles like those at PC World as well as reviews on more then just vendor sites. You won't find just one or two sites for this. You can find sites that regular feature articles and reviews. Just run a few good searches.
yea i really like pc world. They got product reviews, how to's , info on new stuff, all kind of crap. and their database is searchable so there is a good chance if you are looking for something specific, you can find it here
Here's one site that puts everything into separate catagories when you want to look into something specific. All Things Computed has links for everything at http://www.geonius.com/www/computers.html