Mark W. - I'm not too advanced with this, so bear with me.
My example table has 10 rows and 4 columns. all cells contain the word 'test'.
The cells used are A1-D10.
Attempting to follow the instructions in the thread you linked to, I inserted a new blank row 1 and a new blank column A, so the list would begin in B2, as in your example.
I then placed the formula '=(B2<>B1)+A1' into cell A2 and filled down to row 11, corresponding with the last entry in column B.
I ended up with a column of 1's to the left of my table.
I was confused by the next step: "2. Enter the formula into the 1st empty cell below the last used cell in column A that adds 1 to the cell reference above it (e.g., =A13+1), and fill down until a resultant value of 1 is reached."
Obviously I'm doing something wrong. Can you give me a quick step-through?
Mark W. - your answer gave me this idea:
In the first 3 cells of the first column to the right of my table, I entered 1,3, and 5. I then filled down to the end of the table, creating a column of odd numbers next to my table. Then I entered 2,4, and 6 underneath that, and filled down at least the same # of rows as my table, creating a column of even numbers in the blank rows. Then I sorted by my new column - the even numbered rows filled in between the odd numbered rows, and I had my spaces.