Besides TomF's great suggestions of using column groups and hiding columns, one more option would be to color cells or the text in cells (groups and hiding are better options as they are on column level).
Also one could script a user interface, which would show you a list of your columns and their properties. Here is very quick example but maybe gives an idea:
Names Default To Here(1);
dt = Current Data Table();
properties_to_collect = {"Formula"};
dt_col_properties = New Table("Table Properties",
New Column("Column", Character, Nominal),
New Column("Data type", Character, Nominal),
New Column("Modeling Type", Character, Nominal),
New Column("Formula", Character, Nominal),
invisible
);
For Each({col_name, idx}, dt << Get Column Names("String"),
dt_col_properties << Add Row(1);
dt_col_properties[idx, "Column"] = col_name;
dt_col_properties[idx, "Data Type"] = Column(dt, col_name) << Get Data Type;
dt_col_properties[idx, "Modeling Type"] = Column(dt, col_name) << Get Modeling Type;
dt_col_properties[idx, "Formula"] = If(IsEmpty(Column(dt, col_name) << Get Property("Formula")), "No", "Yes");
);
f = Function({a},
sel_rows = dt_col_properties << Get Selected Rows;
sel_cols = dt_col_properties[sel_rows, "Column"];
dt << Select Columns(sel_cols);
dt << Next Selected Column;
);
rs = dt_col_properties << make row state handler(f);
nw = New Window("Cols",
dtb = Data Table Box(dt_col_properties);
);
dtb << Set Selectable Rows(1);
dtb << Set Scrollable(20, 0);
dtb << Set Click Sort(1);
nw << On Close(Close(dt_col_properties, no save));
There is also Table Attributes Add-In
-Jarmo