The Yahoo! Design Pattern Library was updated today with new patterns for creating visual transitions, invitations, and page grids. In addition, the team has provided code libraries for windowing control, menus, auto-completion, CSS Fonts/Reset (which provide an optimal font-sizing strategy that normalizes browser-supplied CSS defaults), and Page grids (which provide seven basic wireframes and components taht together offer more than 100 page layouts — all of which scale up in size when the user applies browser-level font zooming).
If all that wasn’t enough, Bill Scott (the hardest working man in rich internet applications today) provides a detailed look at the design considerations behind the invitation design pattern. Enjoy!