I would like to give a brief update on the crashes reported in the previous post. As my testing RPi is currently installed in a remote location, I was not able to try other power supplies yet. But thanks to Brandon’s great tip I have activated the BCM2708 watchdog function. The RPi is now automatically rebooting after every crash, thus leaving a downtime of maybe a few minutes per week.
Update, Nov. 1st 2012:
The issue seems to be resolved by setting
vm.min_free_kbytes = 16384
in /etc/sysctl.conf, according to this description:
After adding this line, the crashes went away. This fix is included in upgrade #4 as well as the latest image dated 01/11/2012.
I have been trying several different power supplies as well, but it did not really help. In the end, I am just using an old Samsung phone charger now and it just works fine.