I am a business informatics student from Germany and i am currently testing the chart creation and the graph builder of JMP8 for my diploma thesis. My first obvious question or thought that i ran into is: Why is the graph builder - with the nicely implemented drag&drop for variables and groupings, not for the creating of all types of charts? It seems to me like the use for the graphbuilder is more in statistic data. Its a very nice tool, but you can only produce Scatterplots with it. Ok you can also add columns to the chart after creating it BUT, if there are multiple y-values for one x-value and you want to add columns to the chart, its necessary to prevent the values from overlapping over one x-axis value to have each point as a column. Maybe I dint discover that feature yet, but the quintessence is still the same - why is the GraphBuilder not for all types of charts....
Dual axis displays are not included in Graph Builder for JMP 8, but may be in a future version. Singles axis graphs may be better depending on audience. See http://www.perceptualedge.com/articles/visual_business_intelligence/dual-scaled_axes.pdf
I just downloaded the trial of JMP 8 for Mac and I am really impressed with the ease of use and responsiveness of the Graph Builder tool. However, it is currently not very stable on the Mac (Leopard, Intel). JMP frequently crashes when I am playing around with Graph Builder. Although not 100% predictable, it often seems to happen when removing the X or Y (by dragging it off the chart) from a grouped design.
Simple linear fits would be a very useful addition to the display options (Smoother, Points, Line). Also a "median" option among the "Summary Statistic" choices would be welcome
Instead of adding a second axis for another y variable, I just plot the second variable above (or below) the first variable by dragging to the top (or bottom) of the y axis. I think this is an easier way to visualize the 2 individiual variables.
I make multiple types of graphs with graph builder. It supports bars, lines, box plots, scatterplots and histograms. Chapter 43 of the JMP Stat & Graph Guide (pg. 937 in the on-line documentation found under Help>Books) has a very good description of most of the capabilities of the Graph Builder.