This Card-Review article was written by openCards user Decipher-Games at Jan 2nd, 2008.
Quote from Free Warp-Pack Rulesheet:
These two cards are aimed against tactics which newcomers might otherwise find overwhelming. They help balance the use of some other cards without eliminating any exisiting strategies. Yellow Alert helps mitigate the power of Red Alert cards, while Countermanda stops Telepathic Alien Kidnappers and "throws a monky wrench" into a strategy which relies heavily on Res-Q or Palor Toff.