This is what I get this morning when I do an: apt-get upgrade. It seems worrying to upgrade all these critical packages.

Nokia-N900-41-10:~# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
policy-settings-rx51
The following packages will be upgraded:
alsa-policy-enforcement bme-rx-51 browser-neteal camelisync dsme
hildon-desktop kernel kernel-flasher kernel-modules libbmeipc0
libclutter-0.8-0 libdres0 libgles2-sgx-img libhildon1 libohm-plugin-core0
maemo-launcher mce modest-nokiamessaging-plugin
modest-nokiamessaging-plugin-l10n-cscz
modest-nokiamessaging-plugin-l10n-dadk
modest-nokiamessaging-plugin-l10n-dede
modest-nokiamessaging-plugin-l10n-engb
modest-nokiamessaging-plugin-l10n-enus
modest-nokiamessaging-plugin-l10n-eses
modest-nokiamessaging-plugin-l10n-esmx
modest-nokiamessaging-plugin-l10n-fifi
modest-nokiamessaging-plugin-l10n-frca
modest-nokiamessaging-plugin-l10n-frfr
modest-nokiamessaging-plugin-l10n-itit
modest-nokiamessaging-plugin-l10n-nlnl
modest-nokiamessaging-plugin-l10n-nono
modest-nokiamessaging-plugin-l10n-plpl
modest-nokiamessaging-plugin-l10n-ptpt
modest-nokiamessaging-plugin-l10n-ruru
modest-nokiamessaging-plugin-l10n-svse nokiamessaging obexd ohm
ohm-plugin-resolver ohm-plugins-misc opengles-sgx-img-common
operator-wizard-settings osso-abook-home-applet osso-mission-control
pulseaudio-policy-enforcement python-gobject python-xml
rtcom-notification-ui rtcom-presence-ui softupd tablet-bookmark-manager
tablet-browser-controls tablet-browser-ui tablet-browser-widgets
xserver-xomap xserver-xorg-core xserver-xorg-video-fbdev
57 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Need to get 10.0MB of archives.
After this operation, 315kB of additional disk space will be used.

usually it's not good idea to use apt-get upgrade, unless you're prepared to reflash

Yeah, I've seen those upgrades but without a flash image was not too keen on applying them - if it ain't broken, don't fix it.