Just few random comments
- wlan fix - maybe it is better to link the bug in bugzilla or the thread here in case my site goes down

- cloning without using kernel with faster mmc wil not give massive speedups, it will take off some load from CPU due to no jffs2 compression and may make your device more responsive under load but the average read/write speed is about the same (slow mmc vs compressed jffs2). So yes it may speed it up a bit but not significantly so I wouldn't put it on first place when mentioning advantages. Having backup and more room is bigger reason. You can still have it worded like above but someone may complain (after long and frustrating cloning process) that there is no speedup.

-partitioning - sfdisk has -uM argument which takes all units in megabytes, this may be more intuitive when selecting partition size

- rebooting - I think it is not needed to reboot after formatting partition, you can regroup it to make only one reboot after optionally flashing kernel and installing boot menu

-ext3 vs ext2 - ext3 will write only metadata twice, not data, metadata is filesystem timekeeping information (file name, attributes, location of blocks belonging to files), yes it it slightly slower and yes it wears the card slightly more but still it may make sense, depends on you, if you use ext2 don't forget to reboot to flash and fsck it when device crashes

I'm not sure where you will publish this guide but it may be better to improve existing guides, the last 'rewrite targeted for newbies' is here http://maemo.org/community/wiki/howt...from_mmc_card/