Revoked Stocks / Recycled Tickers: I noticed today CMKM, a once notorious ticker, has been recycled.
Users can't create a board if a ticker is already in use on iHub.
If anyone knows of any boards on iHub where the company's stock has been revoked, contact an Admin... they won't delete the old board but can update the board so the ticker can be re-used.
Here's the current list, but I know there are more...