Live Ajax chat is one of those Comet 101 kind of examples (as RSS readers were to Ajax back in the day!).
We saw a couple of items from this meme recently.
First, jChat, a showcase chat application using Jaxer:

Jaxer ships with a number of basic samples, but I’ve seen quite a few people online in search [...]

Rakesh Pai has created a Jaxer JavaScript client for Memcached.
Once you load the file you simple configure the main object (change the file rather than calling .config(…) which would make more sense):
PLAIN TEXT
JAVASCRIPT:

JsMemcached.set(”keyName”, “Value here, as long as you want”);

JsMemcached.get(”keyName”);

JsMemcached.close(); // no open() as it is lazily done on your behalf

Aptana has put out their first beta release of ActiveRecord.js. The details according to Ryan Johnson, a developer at Aptana:
ActiveRecord.js is an open source object relational mapper (ORM) that supports multiple JavaScript environments, including:

Google Gears (client-side persistence)
In Memory (if no SQL server is available on the client)
Adobe AIR (client-side persistence)
SQLite and MySQL (via Aptana Jaxer, [...]

The mobile Web is getting increasingly interesting. Nokia has put another hat in the ring with their new Nokia Web Runtime that embeds WebKit into S60 phones:

Widgets — you’re familiar with them from the desktop. Small, focused web applications that are easy to install and use. Perfect for the small screen. Nokia has extended the [...]

AIR 1.5 has been released at MAX this week.
For the folks that like to write AIR apps that at least have some JavaScript, you will be happy to see that WebKit has been updated:

The version of WebKit included in AIR has been updated to a newer version. The updated version includes Squirrelfish, a new bytecode [...]

Paul Colton of Aptana has announced the Jaxer 1.0 release. This comes on the heals of the general availability of Aptana Cloud, and of course their Studio product that ties things together.

First, Jaxer 1.0:

If you’ve already been using Jaxer you’re likely familiar with its database, file system and socket APIs and its ability to not [...]

The Jaxer team has released a release candidate for Jaxer 1.0.

Here a synopsis of all the new features and improvements that have gone into this latest release candidate:

Jaxer.Sandbox: HTTP-level control; support readyState, toHTML, waitForCompletion

Built-in, extensible dispatching for RESTful and RPC service requests

Fast, native JSON support

Improved APIs for HTTP Request and Response

More flexible handling of application [...]

Jaxer has been out in beta for a while and is nearing its 1.0 release. Many comments on Ajaxian about Jaxer have been about performance benchmarks. Uri Sarid, CTO of Aptana, has compiled some initial benchmarks including comparisons to PHP and Ruby on Rails. (Jaxer comes out in between the two):

We wanted to answer a [...]