Userscripts.org

Minimal layout for Gmail.

Mimics a "Compact" density setting for Google Contacts (until it is implemented natively by Google)

This CSS tweak will make Google Reader's new look more compact and less depressing by adding some eye-friendly green colors. Inspired by lipsumar's "Google Reader compact" and Green Sky GMail theme.

Makes the left-hand side navigation pane in Google Calendar collapsible.

Even more compact design for Google Reader with Google+ Integration. Constantly kept up to date.

Removes the top bars in Google Reader to make more room for your feed reading.

Includes features of multiple scripts that help to make google reader faster and better.

Show/hide the header, footer and sidebar tabs on iGoogle to save space! Perfect for small screens or netbooks!

Improvements for e-shuushuu: Sidebar by default is hidden; Images are zoomable; Replies are hidden, but can be shown; Search now is in pop-up.

Make Yahoo compact and with ads where they belong [DEAD]

my personal version...for my girlfriend :P very minimalistic... wallpaper from interfacelift (see source) oh...and disable suggest...in preferences...

This maximizes the vertical real estate in GMail by collapsing the links on the left to an image box, and moving the search to left side (This is a modified version of Pavel Gutin's original Gmail Compactor).