I upgraded the firmware of my MBL to 02.02.02-020 few days ago and noticed that the sources.list on /etc/apt directory now only has one active line and that is pointing to squeeze main depository. no listings for lenny and before any more. So the suggestion to comment out this line in the "First Steps" section now appears moot.
Whoa! Does that mean we could also simply dist-upgrade it to Squeeze? (I've done some tampering with the system, so I've stopped upgrading the firmware — if I understand correctly, firmware updates could spoil my customized software configurations…)