OvisLink's AirLive 802.11g adapter for USB 2.0 has an impressive array of features: It's a nifty little device that retails for about $35 with included support for Windows 98SE through XP, 802.11b and 802.11b, USB 1.1 and USB 2.0, and WEP and WPA. You can even adjust power output, which should reduce battery drain when that's an issue. [link via Tom's Networking]
Linksys ships Compact Flash 802.11g adapter: This $90 adapter is the first 802.11g Compact Flash device. As Tim Higgins notes in his overview, you won't see 802.11g speeds, but you will reduce the impact on an 802.11g network by not forcing it to drop down to a mixed 802.11b/g mode.