Jerry Yang, co-founder of Yahoo, has resigned from the company's board, as well as "all other positions with the company," effective today. Specifically, he'll also no longer be on the boards of Yahoo Japan or Alibaba Group. Yang doesn't say that he's retiring: "The time has come for me to pursue other interests outside of Yahoo," reads his statement in a press release. Carol Bartz originally replaced Jerry Yang as CEO of Yahoo in January of 2009, and was herself pushed out of the company in September of last year, and former PayPal president Scott Thompson took over the reins of Yahoo just last Monday, January 9th. Here's Yang's whole statement:

My time at Yahoo!, from its founding to the present, has encompassed some of the most exciting and rewarding experiences of my life. However, the time has come for me to pursue other interests outside of Yahoo! As I leave the company I co-founded nearly 17 years ago, I am enthusiastic about the appointment of Scott Thompson as Chief Executive Officer and his ability, along with the entire Yahoo! leadership team, to guide Yahoo! into an exciting and successful future."

That's pretty much all we know right now, though The Wall Street Journal recently reported that multiple Yahoo directors might be leaving. Yang's divesting himself pretty thoroughly, so imagine his "other interests" might include something we might also find interesting.