slimScroll is a small (2.8KB) jQuery plugin that transforms any div into a scrollable area with a nice scrollbar – similar to the one Facebook and Google started using in their products recently. slimScroll doesn’t occupy any visual space as it only appears on a user initiated mouse-over. User can drag the scrollbar or use mouse-wheel to change the scroll value.
Masonry is a dynamic grid layout plugin for jQuery. Think of it as the flip-side of CSS floats. Whereas floating arranges elements horizontally then vertically, Masonry arranges elements vertically, positioning each element in the next open spot in the grid. The result minimizes vertical gaps between elements of varying height, just like a mason fitting stones in a wall.