Visuwords is an exciting new site which lets users create their own type of graphical dictionary. The way this works is very wiki-esque, you browse for a term, if it is not there it puts the term on a blank page. From there you can edit your term and link them to others, similar to how you would be creating a concept map in Inspiration.
While I think this is a nice tool there still are a lot of terms not listed. I suggest giving it a try as it is very user friendly. A bonus for some will be the ability to download the source code (Unix).
Here are the results from browsing the term "technology". Each color and line represents a specific type of "relationship".
Give it a try by clicking here.
For another in depth review check out the always resourceful Free Technology 4 Teachers blog.