Regarding the Ck-300 problem there is a bug that has been reported here - https://bugs.maemo.org/show_bug.cgi?id=9367

If you have experienced this problem adding your comments to it cant hurt and may even grab the attention of a bug fixer in the hope that they sort it out.

As an addendum to my pervious comments I have
1. uninstalled all applications with App manager
2. backed up to sd card
3. reinstalled PR 1.2 with PC Suite
4. restored from sd card

This didnt help at all, lol, sorry. Same problem. However I have had about a week of no problems, ending today when my n900 froze up again.

The only thing different is I followed the suggestions give on the bug.
1. I installed rootsh (download from apps)
2. In X-terminal typed "sudo gainroot"
3. typed 'killall -9 pulseaudio'

Now, I dont profess to know anything about how this works or even if I doing it right but it may be linked to my week without problems. Let me know if you get any joyplease.