Can I have 2 (or more) charts in my Windows 7 gadget?

You can continue to add charts, by entering the chart ids for each chart into the gadget options box. To access the gadget options, hover over your LilySlim gadget to get the menu to display, then click on the Options button (it looks like a little spanner). Click on OK when you have finished entering your chart IDs.

multiple tickers
You can change the order of your charts by, moving the chart ids around.