Some of the best plans available are from woodworking magazines. After all, presenting woodworking plans in a clear and understandable way is what they do.
You'll find a large variety of free plans on their web sites, which usually include step-by-step instructions, illustrations or photographs, material and tool lists and sometimes even printable plans.
Check out this project page provided by Taunton's Fine Woodworking Magazine and you won't be disappointed. Once there just click on the projects tab. http://www.taunton.com/finewoodworking/
Then visit Wood Magazine at http://www.woodmagazine.com/woodworking -plans / Last time I checked they were highlighting plans for a Mission style sofa and several types of woodworking jigs.
Last but not least, make sure you visit American Woodworker Magazine. In order to view the plans you'll have to sign-up. All this requires is coming up with a name and a password, and providing an email address. It's well worth it since you can then access their plans, which are loaded with photographs and detailed instructions. http://americanwoodworker.com/blogs/projects /
There are many more woodworking magazines out there, including Woodcraft, Workbench, Woodworkers Journal, Shop Notes and Woodsmith, and those devoted to specific types of woodworking such as routing or scrollsawing. Though they may not all offer free plans they all offer tips and suggestions that you shouldn't overlook.
Finally, you should also check out the forums for leads to more woodworking sites. WoodNet.net is one worth looking at.
Always read and follow the safety instructions that came with your power tools.