Maybe I'm a bit late to add much here, other than to say I believe most I-Openers which network do so via USB NIC's. My understanding is some of the older 10 (not the 10/100) usb adapters (and the wireless warplink adapters) had issues.
I've been happily using a SMC 10/100 wireless usb for well over a year now on several I-Openers, and currently have 3 (actually all 3 are currently active and surfing as I type this) wireless I-Openers using DWL-120 802.11b adapters (D-Link) without a hitch/glitch!
I recall some discussion of issues (problems) with the Linksys 10 wired adapter. If it helps, before I encountered I-Openers I never used USB, now I prefer USB devices... it's much easier to just unplug to port than not!