KnowledgeBase
Developer
KernelTeamBugPolicies - How to triage kernel bugs.
KernelDevelopmentShift - New development model.
KernelGitGuide - Using the git repos.
KernelUpdates - Updates to stable kernels.
KernelMaintenance - How to maintain the kernel.
KernelMaintenanceStarter - Cheatsheet for KernelMaintenance.
KernelBugFixing - Process flow for fixing kernel bugs.
KernelTeam/KernelBuildScripts - Information on how to use some helper scripts for remote building.
KernelPatches - Why we will or won't take patches.
KernelPackageVersioning - How to version changes to kernel packages.
KernelPackageABIRelationships - Which packages need ABI bumping during stable updates.
Debugging
DebuggingIRQProblems - Help debugging common IRQ problems.
DebuggingKernelSuspend - Help debugging suspend/resume problems.
KernelPPA - Instructions on how to use the kernel team's PPA as well using a specific kernel developer's PPA.
BIOSandUbuntu - Debugging BIOS issues on Ubuntu (DSDT, Reboot, Suspend/Resume)
User info
KernelCustomBuild - Building your own kernels - Q&A
GitKernelBuild - Build mainline kernel from git. Also help with submitting bugs to upstream bugzilla.kernel.org
LinuxWireless - Testing and reporting bugs to the upstream linux wireless developers
Reference
KernelVMAddressing - Per-arch breakdown of VM addressing