Between starting the book in September of 2010, a lot of mobile pattern collections have emerged.

I actually disagree with the principles behind most of them. Not all, but many. I've talked about this in some presentations, so for the record:

• Screenshot focused.
• Few or no explanations.
• Interface focused, with few nods to interaction.
• Too focused on one OS. Mostly, iOS.
• Mostly, really, iPhone. Far too often mobile means handsets.
• One tier of organization, and no cross-referencing. If you don't get their method of organization or referencing, you may not understand what options are available.

Of course, you may disagree. The presence of these is another key reason I am not worried about having too many screenshots in my patterns. Enjoy:

• Android Patterns - One of my favorites, each pattern is drawn, has a lot of explanations and describes the interaction, and there's a really snazzy organization to help you drill down to the options available for your design problem.

• Lovely UI - A collection of mobile UI elements.

• Mobile Design Pattern Gallery - Also an O'Reilly author, Theresa Neil has published this supporting website with the patterns from the book. They are abstracted at the top level, then explained as screenshots.

• Mobile Patterns - Ryan Sims' collection of patterns, with the opportunity for you to contribute your own to the collection.

• Mobile UI Patterns - Mari Sheibley's quite large, and regularly updated, collection.

• Pttrns - By By Robin Raszka & Chemix, seems to be more focused on interfaces (screen design) than even the others.

• Screenshots for Designing Mobile Interfaces - This is just a collection on Flickr, of all the screenshots (or often, photos) of the various devices I own. Not organized into a library, but if you were looking for an old device especially, it might be here. Enjoy.

Anti-Patterns & Worst Practices

What would our jobs be without making fun of others? But really, it's important to recognize bad solutions, and know why they are bad. Here's a couple places that collect bad mobile solutions.

• WTF Mobile Web also on twitter @WTFMobileWeb. This also explains real well the point of sharing antipatterns.

• We have a mobile site!