While I’m working over at Message, most of work consists of fairly hardcore PHP and MySQL.
I’ve been trying to plug what Dave Shea calls "the RSS usability hole" by intercepting clicks on the button that leads to my RSS feeds and popping up a window with a brief explanation of RSS. The idea being that people who don’t know what RSS is aren’t confronted with a page of apparent gibberish. The link can still be dragged (or copied and pasted) into a newsreader.
I’ve also been tightening up the way my image galleries work. By default, each gallery shows the first image in the set instead of just a blank image. Clicking on the "random image" feature also takes you straight to that image instead of just straight to that gallery.
These days, though, using little bits of DHTML magic can be quick and easy and still work across a huge range of browsers.