When on vacation, I always buy a local SIM card and use Android's "mobile hotspot" feature to provide Internet access to two Windows XP Pro laptops (mine and my wife's).
Unfortunately now the Google Nexus One phone I've been using this way is broken.
I also have an old Nokia D211 PCMCIA card, which I can insert into my wife's Thinkpad X61s. You can insert a SIM card into it and it provides GPRS Internet:
Is there something I can set up on my wife's computer so that she can share/provide/forward Internet access to me?