So I've played around with it more since the last time I mentioned it, here's a couple new tricks.

Autofit your spreadhseet columns:
cartSheet.Columns.AutoFit

Autofilter your columns:
cartSheet.Cells.autofilter 3, "DOWN"

Bold a range of cells:
objExcel.ActiveWorkbook.Worksheets(1).Range("A1:J1").Font.Bold = True

At some point I'll add to the tutorial...