One of my favorite features that came out of Google Finance was the extended hours trading on charts of logged in users. Real time quotes in after hours trading was already common in both Yahoo!'s and Google's finance products, but visually displaying the pre-market and after-market movements diagrammatically was important because it displayed the history of the price movement per share of a stock, whereas beforehand, you only had the current trading price during active after-hours, or the last price after that session had ended. It has also been a particularly useful way to guess the trend to be at the opening bell.
A couple days ago, they introduced a tiny detail that I believe users will find helpful - any digits changing in the displayed price will flash green or red momentarily, depending on whether it's an upward or downward change. To put it in perspective, the norm before this was to only color-code the difference in points or percentages, not any part of the price itself. This is a small step, but it reminds me of the days in the late 90's when CNBC turned their navy blue change indicators and values to color-coded green and red values, a novelty that has long since become a standard.
Beyond that, still among my past favorite interface details are - showing news indicators on the charts at the point where news was announced, and transactions tracking to monitor gains and losses. The next step would be to somehow make this site scalable on a mobile viewport, the Flash support on various mobile devices notwithstanding.
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