RRDtool is a great gizmo for storing and displaying time-series data.
Normally it creates PNG or GIF graphs to display info,
but often I want to zoom in/out, turn on/off data lines, etc.
This is normally non-trivial. But a Flash-based UI for RRD display would make it easy.
Random experiments, circuits, code, rapid prototyping, sometimes things to buy, and the odd tune by Tod Kurt.
you’ve got this functionnality in the latest cacti app. Just go through the code and check how (good luck :)
Cheers