The last week or two has been jQuery heavy. There were lots of string matters to handle after using Python to extract data from .xls spreadsheets. In the end, I didn't get to use CouchDB, so handling JSONs well was necessary.
_ http://www.tvidesign.co.uk/blog/improve-your-jquery-25-excellent-tips.aspx
_ http://net.tutsplus.com/tutorials/javascript-ajax/10-ways-to-instantly-increase-your-jquery-performance/

Manipulating the DOM within a looping routine is a bad idea. Instead, I used the loop for string concats then added to the DOM at the end of the routine. $.nano is the fucking shit.

I looked up string performance, but the differences weren't significant for my case.
_ http://www.skymind.com/~ocrow/python_string/
_ http://www.sitepen.com/blog/2008/05/09/string-performance-an-analysis/

Caching jQuery objects wasn't obvious to me for a while. Caching anything for that matter is fairly new to me. Here's some bullshit I might've ran into, but not exactly sure. jQuery might have updated this issue since this post.
_ http://daudahmed.wordpress.com/2009/07/12/weird-getjson-caching-behaviour-in-ie6-and-ie7/

I had the opportunity to use Cufon. It's fun, but only seems to work well for rendering header text.

in operator, hasOwnProperty()
_ http://stackoverflow.com/questions/1098040/checking-if-an-associative-array-key-exists-in-javascript
_ https://developer.mozilla.org/En/Core_JavaScript_1.5_Reference:Global_Objects:Object:hasOwnProperty

JavaScript: The Definitive Guide
JavaScript: The Good Parts

Hoverflow for queuing events
_ http://www.2meter3.de/code/hoverFlow/demos.htmlaneharnett.com/

jQuery handling <iframe>s
I stopped working with iframes and used $.get to fill a sdivs with the html content, and had CDS write me a few regexs to extract some markup within the iframe content.
_ http://ideamill.synaptrixgroup.com/?p=6
_ http://huuah.com/jquery-and-iframe-manipulation/
_ http://www.bitsandpix.com/entry/jquery-iframe-find-elements/