A recent client project increased my exposure to integrating jQuery with WordPress.
For this client I had to design a filter interface enabling the user to choose a category and then pick a time range to search for rated posts (if not all time) and then finally the resultant posts are sorted by ratings. For the ratings the site already used the excellent plugin WP-Post ratings from Lester Chan. I made minor tweeks to this plugin so it could search for rated posts based on the date they were posted (rather than the date they were rated).
I utilised jQuery to perform the category highlighting, date selection and to inject the results in the page without a page refresh. Very neat and visually appealing I know, like most other developers that jQuery will be used more and more.