[glc]

Your choices for replacing adapters:

For laptops and other mobile devices that use a standard mini-PCI card (possible compatibility issues with some devices):

TP-LINK TL-WN861N Wireless Adapter IEEE 802.11b/g/n 32-bit Mini PCI Up to 300Mbps Wireless Data Rates WPA2 - Newegg.com

For devices that use a standard mini-PCI Express card:

Newegg.com - Intel Centrino 2200BNHMW IEEE 802.11n Mini PCI Express - Wi-Fi Adapter

For desktop computers that have a PCI-Ex1 slot:

Intel 2200BNHMWDTX1 PCI Express x1 Centrino Advanced-N 2200 for Desktop IEEE 802.11b/g/n Up to 300Mbps Wireless Data Rates - Newegg.com

For desktops that have a PCI slot:

EDIMAX EW-7128Gn PCI Wireless Adapter for PC and Mac - Newegg.com

For anything that has USB, there are all kinds of USB adapters out there, the ones with external antennas work better but they can get in your way.

TP-LINK TL-WN822N High Gain Wireless Adapter IEEE 802.11b/g/n Mini USB 2.0 Up to 300Mbps Wireless Data Rates WPA2 - Newegg.com