Copying Data To Next Empty Row In A Macro

I am trying to do is copy two ranges of data from one sheet and past the values to one other sheet. The trick is not having the data overwrite each time the macro is run (I need the data to be pasted to the next blank row). Also, as there are two ranges of data to be copied, I need to define which rows the paste is to start at e.g. copy data from sheet 1, Range("B8:M8") and paste to the next blank row on sheet 2 starting a cell "A3" AND copy data from sheet 1, Range("B9:M9") and paste to the next blank row on sheet 2 starting a cell "A20".

I've managed to get this far (see below) by pasting the data into two separate sheets but cannot work out how to modify the macro so the data can be pasted into a single sheet with conditions outlined above.

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Sub Stats()

Application.ScreenUpdating = False

Dim NextRow As Range
Set NextRow = Sheets("Past Stats Mar to Aug 2010").Cells(Cells.Rows.Count, 1).End(xlUp).Offset(1, 0)
Sheets("Current Stats Mar 10 to Aug 10").Range("B8:M8").Copy
NextRow.PasteSpecial (xlValues)

Dim NextRow2 As Range
Set NextRow2 = Sheets("Past Stats Mar to Aug 2010").Cells(Cells.Rows.Count, 1).End(xlUp).Offset(1, 0)
Sheets("Current Stats Mar 10 to Aug 10").Range("B9:M9").Copy
NextRow2.PasteSpecial (xlValues)

Application.CutCopyMode = False
Application.ScreenUpdating = True
End Sub
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