Does Linux still only use UMTS, 3G, edges, GPRS, packet & WCDMA cards as serial modems?
Has kernel support been added to use these cards as NICs or NDIS devices?

Windiz connects as serial modem, then uses these cards as NICs, so data rate is always faster than Linux.

If full kernel support of Cellular data cards is being developed, who is doing it?

I have seen many post of these type of devices. I would use the search tool here to search the forum. Also mant post using the http://www.google.com/linux . Search for the devices you mentioned there.

Brian

I agree, you would search the forums and search WWW again. Would you still not understand the question or the problem? You might also read documentation provided by Kyocera, Qualcomm & Sierra. Top Global & Stompbox are 2 more.
Cellular data cards are intended to connect as serial modems, then run as network devices. Linux has only been doing the serial modem part, so data rates have been much less than with Windiz.
Ubuntu 7.04 formatted my /home, so I can't show you the web page that stated Linux kernel would soon have NDIS support for cellular data cards.

Does Linux now do NDIS with cellular data cards?

Not sure but I think this is the way the ndiswrapper module works with standard wired and wireless nics using the inf driver from the windows side. You might contact the developers of ndiswrapper and see what input they have.

Brian

NDIS wrapper people did not reply to my email. Person @ kernel.org gave no reply. Maybe I should keep looking but I am about to quit & wait for Linux data card speed to improve. I can't even find a kernel programmer that wants my KPS650 card to test. Repeated offers of card shipped free, no return, got 0 answer. It's here for any kernel programmer that wants it.