Sometimes your regular wireless card just won't cut it. I know of a few places that I like to frequent where I'm just on the edge of a wireless signal, so I either get a really poor connection, or non at all.
That's where Buffalo Technology's new Wireless-G High Gain USB 2.0 adapters come into play. The first one, the WLI-U2-SG54HG has an omni-directional antenna that will attach itself to the back of your laptop (or desktop if you prefer) with suction cups. The other WLI-U2-G54HG is a unit that sits next to your notebook that is lightweight and has a signal strength indicator built-in.
New Buffalo Hi Gain USB WiFi Antenna with 1600 ft Range [via everythingusb]