Going BATS over Yahoo Finance

I’ve used Yahoo Finance since 1997, I think.  What a great resource.  Today, they announced the return of free real-time quotes.  Nice, though I went through three phases in my reaction.  The first was, “Yes, the whole real-time market.” The second was, “What, just an ECN?”  The third was, “Okay, they trade 9% of all shares traded… that’s not ideal, but that’s pretty good.”

Now, how could Yahoo improve this?  At present, the ECN real-time quotes are only available on single stock quotes.  Create a view where they can be applied to portfolios, and things gets a lot better.  Let those quotes stream, and you have an amazing service.