Kernel 2.6.4 .config file for this hardware. Using udev filesystem
/usr/src/linux/.config

If your motherboard has the nforce2 chipset, then this kernel needs to be patched to solve the locking madness when APIC is enabled in the kernel.
nforce2 disconnect quirk patch

This patch was meant for 2.6.0, so you need to hand edit fixup.c or make changes to the patch so that it fits in the right place.
OR
Directly replace /usr/src/linux/arch/i386/pci/fixup.c with this file -- changed fixup.c

My make.conf file.
/etc/make.conf

For adjusting DMA and other performance related settings for Hard Disk and CDROM.
/etc/conf.d/hdparm

For autoloading some necessary kernel modules at boot time.
/etc/modules.autoload.d/kernel-2.6

Configuration file controlling Xserver behaviour. Added new font paths and some Geforce4 based settings for eyecandy.
/etc/X11/XF86Config

Mount settings for dual boot with Windows XP, winex and CDROM?RW.
/etc/fstab

Boot loader with dual boot (Linux + Windows XP) and framebuffer settings.
/boot/grub/grub.conf

One of the best Window Manager around. Stable, keyboard friendly yet at same time sexy n sleek.
~/.config/openbox/menu.xml
~/.config/openbox/rc.xml