http://lxr.linux.no/source/ Linux Kernel Source Browser http://www.tldp.org/LDP/lkmpg/2.6/html/index.html The linux Kernel Module Programming Guide http://kernelnewbies.org/documents/kdoc/kernel-api/linuxkernelapi.html The Linux kernel API http://lwn.net/Articles/2.6-kernel-api/ API changes in the 2.6 kernel series --sadyc