In case you missed it, this isn't just proof of concept, as Warren commented that they are actually using Gantt charts in his company's own internal pipeline database. Very cool! Thanks to everyone for your comments and contributions.
I don't have anything new to add to the discussion myself, but I did want to highlight one other technique that was brought to my attention. Noel Tigcal sent me a sample database that used a neat variation of the idea. Instead of using image resources for the bars, Noel uses the "█" symbol with @Repeat. This allows you to easily change the styling of the bar by modifying the text properties of the column. In the example database, Noel uses Arial Black as the font type.
Quite a smart idea and probably one of the easiest to implement, as you don't have to mess with graphics at all. Nice job, Noel...thanks for sharing!
With that, I'll leave this topic to rest. I'm not 100% convinced that true Gantt charts in Notes views are such a good idea (might be better relegated to a traditional project management tool or to a composite application), but still I hope you see that the underlying technique could have many possible uses.
Oh...by the way...in case you wondered how all this started, you can thanks Mr. Elgort for asking the question. :-)