Fine Homebuilding Magazine

Articles on using a variety of tools including circular saws, nail guns, and a skid-tier loader.
http://www.taunton.com/finehomebuilding/pages/fh_feat_tool.asp

Better Homes and Gardens: Tool Dictionary

Short descriptions on the use and application of each tool along with sketches.
http://www.bhg.com/bhg/stepbystep/home/glossary.jhtml?type=tool&start=A&end=D

BobVila.com: The Essential Toolbox

Review of the uses of the most common tools needed for home improvement.
http://www.bobvila.com/ArticleLibrary/Location/Workshop/EssentialToolbox.html

How Stuff Works: Inside an Electric Screwdriver

Photographic tour inside an electric screwdriver, with explanations of how different components work.
http://www.howstuffworks.com/inside-sd.htm

Craftsman Tools

Projects, product guide, tool use and tips, service centers, products, event calendar, clubs, and warranty information.
http://www.sears.com/sr/craftsman/product/cr_pr_tools.jsp

How Stuff Works: How Nail Guns Work

Full-color animations showing how pneumatic, solenoid-powered, electric-powered, and combustion nail gun technologies launch nails. Also includes safety information.
http://www.howstuffworks.com/nail-gun.htm

Ms. Builder Hand Tool Illustrations

Illustrations of groups of common hand tools and supplies.
http://www.msbuilder.com/tool/mtoolpx.shtml

Toolmanmike's Woodworking Shop: The Basic Tools of Home Repair

Advice and suggested list of tools to include in a basic home repair kit. Includes photographs.
http://toolmanmike.20m.com

DeWalt Industrial Tools and Accessories

Tool use and tips, service centers, products, event calendar, and warranty information.
http://www.dewalt.com/us/core/

This Old House: Tools, Tips and Techniques

Collection of articles offering tips, advice, and techniques for making better use of many different tools. Also contains "Tom's Essential Tools": a list of forty tools that every homeowner needs for home improvement and repairs.
http://www.thisoldhouse.com/toh/knowhow/tools