There's a lot to know about computers and the Web. I do know my own small corner pretty well, here's a bit of what I know that seems really practical at the moment.

OS Stuff

• How to Customize your bash prompt
• Handy bash aliases
• Keeping your bash prompt from wrapping in unfortunate ways
• Setting up SSH with keyfiles
• Starting ssh_agent at login (you still need to ssh_add your key separately)

Web Development

Client-Side

• The secret trick to setting cookies in IE 6
• How to keep relatively-sized fonts the same size in IE and FF
• How to use CSS to make enclosing containers expand to surround their children elements
• Making scrolling divs without horzontal scrollbars that work across browsers
• How to get the noshade effect for <hr>s using css

Server-Side

• htaccess redirects
• Password protection with .htaccess
• Crontab for dummies like me

Office Applications

• Fill blanks with values in Excel
• Conditionally format numbers in Excel
• Make charts that show more than one kind of data in Excel
• How to print headers in Excel
• Turn your Word document into PowerPoint slides
• Turn off automatic reminders on tasks in Outlook
• Bind styles to hotkeys in Word
• Make tables of contents in Word
• Automatically switch styles in Word
• Set hotkeys in Word
• Advanced filtering in Outlook

Developer Applications

• Nifty vim tips
• Customizing Vim colors
• Intellisense in Vim
• How to execute a shell command in vim