Although I'm still waiting to get pushed the 2.0.2 update, I thought I'd take a look at the linux sources.

Looking at the published gnu linux kernel sources provided by Amazon, only 4 files are different:

arch/arm/mach-mx3/dvfs_v2.c
arch/arm/plat-mxc/isp1504xc.c
arch/arm/plat-mxc/wdog.c
sound/arm/mxc-alsa-pmic.c

These are the kernel (2.6.22) mods from the last Kindle version, 2.0.1 (303870012).

Until Amazon posts release notes, we won't really know what was different in the functioning of the Kindle software, but the kernel changes look like adding in a counter to reboot (6 times) and setting the minimal soundchannels to 2.

Most of my software life I've tried to avoid linux or, rather, learning too much about it.  So, when I say I don't know Linux, that's my story and I'm sticking to it.

This is the contents of the Kindle src 2.0.2 309510017 release.

alsa - Advanced Linux Sound Architecture
 alsa lib 1.0.13
 alsa lib 1.0.13 patch
 alsa utils 1.0.13
 alsa utils 1.0.13 patch
 base files 3.0.14.ipk
 base passwd 3.5.9
 binutils 2.17.50.0.5
bonnie++ - benchmark uitility, storage
 bonnie++ 1.03c
bootchart - a tool for performance analysis and visualization of the GNU/Linux boot process
 bootchart 0.9
busybox - size optimized common unix utilities
 busybox 1.7.2
 dosfstools 2.11 - Utilities to create and check MS-DOS FAT filesystems
e2fsprogs - filesystem utilities for use with the ext2 filesystem. It also supports the ext3 filesystem with journaling support
 e2fsprogs 1.38
 e2fsprogs 1.38 patch
 fuse 2.7.1
 fuse 2.7.1 link.tar
 gcc 4.1.2
 glib 2.12.9
 glibc 2.5
 gst plugins base 0.10.17
 gst plugins base 0.10.6
 gstreamer 0.10.17
 hotplug 2004 09 20
 ifupdown 0.6.8
 iptables 1.3.3
 klibc 1.5
 libol 0.3.18
 linux 2.6.22 lab126
lrzsz - a unix communication package providing the XMODEM, YMODEM ZMODEM file transfer protocols
 lrzsz 0.12.20
 lzo 1.08
 module init tools 3.2.2
 module init tools 3.2.2 patch
 monit 4.9
 mtd utils 1.0.0
picocom - a minimal dumb-terminal emulation program
 picocom 1.4
powertop - a Linux tool that helps you find those programs that are misbehaving while your computer is idle
 powertop 1.10
 procps 3.2.7
 procps 3.2.7 patch
 readline 4.3
 syslog ng 1.6.11
 sysvinit 2.86
 taglib 1.5
 uboot 1.3.0 rc3
 udev 112
 util linux 2.12r

"Fiona" is still around, albeit in legacy code.  In include\linux\platform_lab126.h there's a comment stating that this rev is code named Mario (2.6.22), whereas Fiona was (2.6.10).