From Linux-USB about USB 2.0 Devices:  "if you have the EHCI driver, and a USB 2.0 host controller (EHCI, currently available as add-on PCI cards) then you can use these devices at high speed. EHCI support is available in the Linux 2.5 development kernels, and also in 2.4.19 kernels. (The 2.4.19 code should handle USB disks nicely, but for more complete USB 2.0 support, use 2.5 instead.) At this writing the EHCI driver is labeled 'experimental'."

You can get more information from Linux-USB and their working device database.  

For more information, check Linux1394.org and their compatibility list.

As 802.11a and g are not evenly widely known of, let alone implemented, Linux support is few and far between. To get the latest information about Linux support of these technologies, your best bet is to check with the community.