LVM can be prodded, when it's refusing to let volumes come online, with "vgchange -a y"
It's worth noting that "cabextract" will remove Windows files from .cab files, and "unshield" will extract files out of InstallShield archives. This comes in handy when attempting to dig Windoze drivers out of vendor install CDs when there are no native Linux drivers for a particular bit of hardware.
"grep -L 'PAGETITLE' *.txt"... enough said. There is also great power here, for finding TWiki pages which are just going to use horrible default titles.
Network Related
I felt like installing NTOP recently, and there were some things I felt like recording.