The next step that will make conditional formatting even more powerful will be to allow a cell reference ($D$4) and/or a column reference for the conditional value instead of hard-coding a value (such as the β8β in the example):
One application I would use this for in particular is a resource loading worksheet that highlights values in many columns based on the load being greater than the value in column D. Or, for a little less flexibility, highlighting based on the value in a cell in the header like $D$4. This would allow the user to adjust the value in a single cell rather than having to update 40+ individual conditional formatting rules (because Iβll have a lot of columns that use the same CF rule).