I second this request. It would be nice to have an overview of different portfolios. Google Finance already allows us to track multiple portfolios, it should be relatively simple to add an option to see a summarized view of some or all of the portfolios.
Currently I manually update a combined portfolio, which means entering the same transaction data twice. However, when closing a position in a stock held in different portfolios, the master portfolio always takes the FIFO approach, which does not always accurately reflect profit/loss of the individual portfolios.
Please implement... Google>all the rest :)