"a picture is worth a 1000 words" is a well known statement. When we are doing some documentation(SRS, PRD, Design Docs, etc...) or marketing/sales presentation we use lots of diagrams(eg: Charts, Trees, MindMaps, Tables, etc..) to explain some thing more clearly.
Here you can find a single place where it has some sample set of Visualization methodologies which we can use within our documentaions or presentations.
Check this out: http://www.visual-literacy.org/periodic_table/periodic_table.html
Move the mouse into each square and check the sample diagrams available.
I hope this will be helpful for Business Analysts, Sales/Marketing people, Technical Writers, etc...