Linux on Laptops, http://www.cs.utexas.edu/users/kharker/linux-laptop/: this is the most comprehensive resource out there—it has an enormous list of the specific makes and models on which Linux has been installed and can give you (several, in some cases) complete walkthroughs of all the things required to get Linux running on your laptop. If you're thinking of buying a laptop and want to know if it is supported by Linux, this is the place to look.
Linux PCMCIA information page, http://hyper.stanford.edu/HyperNews/get/pcmcia/home.html: this is quite a useful web page containing everything you want to know about PCMCIA and Linux, including a complete list of all supported hardware, the Linux PCMCIA HOWTO and the Linux PCMCIA programmer's guide.
