Efficient computer tools: what would you put on the list?

What tools do you use to be efficient while working on a computer, be it online or not? Things like del.icio.us, dropload, winzip, phpbboards, group blogs/wikis, etc. Are there any books for general fine tuning of already computer-familiar users? What about seminars?

I was thinking about everyday things people do to speed up their work - like, not everyone uses alt+tab, for example, to switch between app windows. I was also thinking about how to travel as lightly as possible business wise - so, if all your data & tools are stored online, it's just you and the suitcase. I know this is probably a cloudy question, but I know you guys can help me clarify. :D

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