I remember being a little surprised when Apple’s (AAPL) market cap caught up and overtook Google’s (GOOG) earlier this year. I wondered at the time how long that would last. Apple’s stock share price has been on a tear for most of this year. It has more than doubled since the beginning of 2009 (up around 120%). Google’s share price is up nearly 80% since the beginning of the year. But because of the arithmetic involved (share price times number of shares available), Google’s market cap is back to being larger than Apple’s again as of October 16, 2009.