http://www.macupdate.com/app/mac/5721/tinkertool
Exposes additional preference settings for OSX allowing things like sloppy focus (activate window on mouseover) and probably other cool stuff. Must have.
http://www.coconut-flavour.com/coconutbattery/
Great little (free, beer) app for OSX that shows detailed battery information.
http://lifehacker.com/5985248/top-10-underhyped-mac-apps
Good wee article on lifehacker hilghlighting 10 underrated mac apps worth having. A few are free, and some seem worth checking out.
https://wiki.ubuntu.com/MagicFab/SSDchecklist
Tips on running Ubuntu on an SSD. Useful to check back when upgrading to 10.10 or later.
http://iamyouruser.blogspot.com/2009/03/ubuntu-eject-kindle.html
Quick tip on how to eject an Amazon Kindle on Ubuntu. sudo eject Kindle (or appropriate device name if you changed it).