Recently I needed to boot a Dell server (PE1950) from a USB flash drive. The flash drive contained a bootable image from the CentOS 5 DVD (images/diskboot.img), to run the CentOS installer, and kickstart the machine over the network. When cold booting these machines (eg. from a power down state), there is no problem at all. I simply hit F11 to enter the boot menu, choose the Front USB flash drive that shows up in the menu, and the machine starts booting - no problem here.

When I moved from syslog to syslog-ng on my laptop running Fedora 7, I noticed a lot of these warnings in /var/log/messages:

Jul 10 09:29:34 speedy syslog-ng[2272]: Number of allowed concurrent connections exceeded; num='10', max='10'