Repo.js. I found the Source-Highlighter through this - a small jQuery plugin that easily embeds a GitHub repository into a website. Very practical if you want to integrate your projects into your own websites and don't want to hand over the entire website to GitHub.
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isagalaev/highlight.js. Just stumbled upon it, a small JavaScript source highlighter that works with a language heuristic and thus does not require explicit specification of the language to be colored - it simply tries all languages and takes the one with the most recognized syntactic elements. There is also a jQuery VanGogh jQuery plugin for this.
jQuery Masonry. Alternative to BlocksIt. Worth checking out. Even pushes blocks more aggressively, rearranges the order if necessary.
BlocksIt.js - Dynamic Grid Layout jQuery Plugin. That's what it says. Sounds quite interesting, I have to check it out.
ResponsiveSlides.js · Responsive jQuery slideshow. I am a fan of Bin and Lightbox, but I also like this small library at first glance - it is simple and easy to use and does not do a thousand things at once, but simply shows images in a slideshow. Specifically for animating header graphics, for example, this could be quite interesting.
DropKick - a jQuery plugin for beautiful dropdowns. Looks nice, even if it is of course mainly a visual gimmick. But sometimes visual gimmicks are also necessary.
JQuery Form Wizard. Interesting small plugin that processes complex forms through steps - and the routes through the form can depend on the data chosen in a previous step. Additionally, #-hacks are used to make the form steps appear in the history (in this form, this is absolutely fine in my opinion).
Roundabout for jQuery by Fred LeBlanc. Nice effect, even if I'm not sure right now what I would need it for (ok, you could use it to display images, but personally I prefer Lightbox or something similar). It's probably just a gimmick, but sometimes that's quite useful.
jQuery: » jQuery 1.6 Released. Regarding jQuery - a new version has been released. I personally find this .attr vs. .prop change somewhat unpleasant - it could bite me in a few places where I work directly with input fields (various widget code in a rather heavy Django application). Of course, it's great that it gets faster - faster is almost always good.
jgrowl. Definitely check it out, because our hand-knitted notifications are just not as nice and stable. jGrowl makes a much better impression, and as a jQuery plugin, it should also not collide with our jQuery codebase.
jRumble | A jQuery Plugin That Rumbles Elements. The new blink tag! (okay, there are indeed sensible applications, e.g., if you want to briefly display an element on the webpage to indicate that something has happened there - similar to bouncing icons in the OSX Dock).
Because I'm not looking for something like this for the first time and it looks quite practical: Sorting elements with jQuery – James Padolsey.
jQuery lightBox plugin is very nice. It doesn't use Prototype or Scriptaculous, but simply jQuery - which is very helpful if a site already uses jQuery. And with the jQuery LightBox Plugin for Wordpress you can easily use it for displaying images in your own blog.