Gliffy.com enables you to build a "wireframe" and site maps for your website. This easy-to-use service can be used to sketch and create your wireframe on the web -- and then share your creation with other stakeholders.
|An example of the Gliffy.com interface and a wireframe.|
You can use Gliffy.com for website wireframing, flow charts, org charts, site maps -- and even a SWOT Analysis!
Here are some example wireframes that you can print out and review: