There has been a ton of WiFi boosters out there but none that really work on the Mac, that is until now. Amped Wireless has release a wifi booster that works with the mac. This is very useful if you only have 1 access point and can't quite reach the pool side or if you need a little boost on the other side of your house.
It becomes available on July 22nd and will cost around $90. You can check it out here.