I use OSX as my primary OS, but find more and more that I stay on my Ubuntu derivative. There is really only one application that I can't seem to replace, and that is Devonthink Pro Office. This there a open format database app on the linux side that replaces it. I use it as a depository for my blog backups, emails, images, and RSS feeds.
Any suggestions would be appreciated!
Cheers,
larrinski