Page dynamically loads images/assets when they are in the browser's field of view. Produces overall faster page loading for it does not have to load an entire page worth of assets if the user is sticking to the top portion of the page.

Tell a friend about interesting content on a website.

http://justaddwater.dk/2008/01/21/interaction-design-send-to-a-friend/

This pattern is aimed for developers. Guys at 37signals have written an artcile about this: http://37signals.com/svn/posts/1048-padded-link-targets-for-extra-comfort

How buttons are to be styled, emphasized, and positioned on web

Pattern would contain stuff like this: http://smartdatacollective.com/Home/16512

audio player, podcast player. single vs. playlisted

http://www.uxmatters.com/mt/archives/2010/01/more-like-this-a-design-pattern.php

Perhaps based on the original Windows 3.1 file manager, or more recently on many of Apple's products, a hierarchy of folders (or other containers) at the left, and clickable nodes display the content at the right. See iTunes as the most ubiquitous example, but it is used for countless desktop software applications or web sites that have a user-editable hierarchy, including drag & drop for moving either nodes or containers, rename (in place) of nodes or containers, and reflection of the node title in the title of the content at right.

Highlight recent changes on the page.

"Completeness Meter" motivates users to invest more time in filling in the form, for example provide more information about themselves.

Example image:
http://www.flickr.com/photos/jannejanne/2533495916/

How to design a good pricing table for a SaaS app.

Reduce the risk of losing data by providing autosave feature.

A language selector is different - as it poses the additional challenge to be displayed in your language versus my language versus all languages available!

Where I can see available (unselected) items one on side and selected one on the other side. Like it is there in Visual Studio (in almost all config screens)