Computes are amazing, especially when consumed by low-level widgets. They are so amazing, I want to see them become an interoperable standard the same way that deferreds have become.
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Design 
When it comes to creating user interfaces (UIs), user experience designers can get too close to the project and lose sight of basic usability. Sometimes you have to take a step back and obscure your view just enough to see potential problems that you might not notice otherwise. Here are some simple things you can do for a quick usability check. These tips are so easy, you'll find yourself doing them all the time.
The Bitovi Team
This week's widget shows how to make "instantaneous" web apps with queued AJAX requests using can.Model and the can/model/queue plugin. The plugin puts an end to spinners, progress-bars, and "loading" text. This article covers how to make apps more responsive with queued requests and recover from service errors.
The Bitovi Team
This week's widget demonstrates the awesome power of jQuery++'s range helper. Text ranges are notoriously a pain in the butt, with major differences in API and implementation across browsers. Similar to jQuery with DOM elements, $.Range provides a simpler API and cross browser methods to create, move, and compare text ranges. If you need to create a custom text editor, text highlighter, or other functionality that understands text, $.Range can be a huge help. For example:
Justin Meyer
I, @justinbmeyer, am going to post a weekly widget made with CanJS. I hope to continue this for as long as I have widgets to write. If you want to see something, please tweet it to @canjs. These posts are going to be quick and dirty. Eventually, I will put these up on CanJS's recipe page with a full description.
Justin Meyer
Hello, my name is jQuery++. It's wonderful to meet you. Have you ever found yourself wishing jQuery had just one more feature or wanted it to be a tiny bit faster? I know I have, but I understand jQuery can't do everything. This is why the team at Bitovi created me, a collection of extremely useful DOM helpers and special events that complement jQuery.
Justin Meyer