Usage:

    new Ext.ux.Sparkline({renderTo:Ext.getBody(),values:[1,2,3,234,345,56,563,34,134,45,456,542]});

    new Ext.grid.GridPanel({
        renderTo:Ext.getBody(),
        autoHeight:true,
        width:250,
        title:'Sparklines',
        view : new Ext.grid.GridView({forceFit : true}),
        
        columns: [{
                header: 'Name',
                dataIndex: 'name'
            },{
                header: 'Stats',
                xtype:'sparklinecolumn',
                dataIndex: 'stats',
                sparkline:{ type:'bar', barColor:"green" } // default sparkline config for the column
        }],

        plugins:[new Ext.ux.Sparkline.GridPlugin()],

        store:new Ext.data.SimpleStore({
            fields:['name', 'stats'],
            data: [
                ['bar (default cfg)', {values:[10,-2,30,10,100,40,6,78,23]}],
                ['line', {
                    // the record can override the default cell config:
                    values:[10,-2,30,10,100,40,6,78,23],
                    type:'line',
                    maxSpotColor:'red'
                }],
                ['box', {values:[1,2,3,10,1,4,6,78,23],type:'box'}],
                ['tristate', {values:[100,50,-13,0,1,4,6,0,-345,345,34,-43,56,7,23],type:'tristate'}],
                ['discrete', {values:[100,-50,13,345,345,345,34,23,12,56,7,23],type:'discrete'}],
                ['pie', {values:[10,50,40],type:'pie'}],
                ['bullet', {values:[10,12,12,9,7],type:'bullet'}]
            ]
        })
    });