Some of the new Senao 2511 cards are now built around the Prism3 chipset, this one, though newer, has less sensitivity (weaker than a Orinoco card/Hermes chipset)
source: UPDATE - 09Jul2004 - Beware of the Prism3 chipset seattle wireless SenaCard review
I also read about it in other places.
however the Dlink DCF 660W
may even be better.
better sensativity means longer range.