The best way to be informed about money is using Transactions Gadgets:

• Transactions Pie Chart -shows pie chart of filtered transactions with chosen statistic type .
• Transaction Charts - shows filtered transactions on time scale. 

You can add as many gadgets as you want. Also, you can set up each gadget to get different types of data:

You can use 'Exept category' in 'Category' field. All the categories listed together with 'Exept category' will be excluded from gadget results.