ThisIsMissEm

@mixin float {
  display: inline;
  position: relative;
}

@mixin float-left {
  float: left;
  @include float;
}

caseyohara

# A list of possible usernames to reserve to avoid
# vanity URL collision with resource paths

# It is a merged list of the recommendations from this Quora discussion:
# http://www.quora.com/How-do-sites-prevent-vanity-URLs-from-colliding-with-future-features

# Country TLDs found here:
# http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains#Country_code_top-level_domains

# Languages found here:

hjortureh

@mixin vendor-prefix($name, $argument) {
  -webkit-#{$name}: $argument;
  -ms-#{$name}: $argument;
  -moz-#{$name}: $argument;
  -o-#{$name}: $argument;
  #{$name}: $argument;
}
		
@mixin border-radius($argument) {
  @include vendor-prefix(border-radius, $argument);

iambibhas

Here is a list of scopes to use in Sublime Text 2 snippets - 

ActionScript: source.actionscript.2
AppleScript: source.applescript
ASP: source.asp
Batch FIle: source.dosbatch
C#: source.cs
C++: source.c++
Clojure: source.clojure
CoffeeScript: source.coffee

alexdmejias

@mixin pte($pixels, $context:16) {
  @return { $pixels / $context}em;
}

pistachiomatt

// Stick all your icons in a subfolder in your images folder. Put retina versions in a subfolder of that called "@2x".
$sprites: sprite-map("NAME_OF_SUBFOLDER/*.png");
$sprites2x: sprite-map("NAME_OF_SUBFOLDER/@2x/*.png");

// stolen from 37signals
@mixin retina-media() {
  @media (min--moz-device-pixel-ratio: 1.3),
         (-webkit-min-device-pixel-ratio: 1.3),
         (min-device-pixel-ratio: 1.3),
         (min-resolution: 1.3dppx) {

tinkertrain

@mixin _position($position, $args) {
  $offsets: top right bottom left;
  
  @each $o in $offsets {
    $i: index($args, $o);
    @if $i
    and $i + 1 <= length($args) 
    and type-of( nth($args, $i + 1) ) == number {
      #{$o}: nth($args, $i + 1);
    }

kawasako

// Mixin

@mixin inline-block() {
  display: inline-block;
  *zoom: 1; // hasLayout true for ie7
  *display: inline; // for ie7
}

ntreadway

@mixin show-it {
  height: auto;
  visibility: visible;
  @include opacity(1); // Compass mixin
}

@mixin hide-it {
  position: absolute;
  -webkit-transform: translate3d(-9999rem,0,0);
  -moz-transform: translate3d(-9999rem,0,0);

robertmagnusson

@mixin size($width, $height: $width) {
  width: $width;
  height: $height;
}