UtilityGeek

Great site with a vast collection of diagnistic tools and utilities for your PC.Tools and utilites divided in more than 25 categories.Also you can discuss your problems with other users on the site forum.

The site also publish latest technology articles which can be acessed directly from the main page.

Tools range from System Tweakers,Registry Utlities to Benchmarking,Bios and

hardware related tools. Check it out here