Changing domains was a big decision. My biggest concern was being able to keep my user, RSS feed, and search engine traffic. Luckily, the power of the .htaccess file allowed me to do so:
Options +FollowSymLinks RewriteEngine on RewriteRule (.*) http://yournewdomain.com/$1 [R=301,L]
The above .htaccess file code, placed on the old domain, redirects the user to the same URL on the different domain.
Quick, easy, and functional.
I work with an awesome cast of developers at Mozilla, and one of them in Daniel Buchner. Daniel's shared with me an awesome strategy for detecting when nodes have been injected into a parent node without using the deprecated DOM Events API.
CSS and JavaScript: the lines seemingly get blurred by each browser release. They have always done a very different job but in the end they are both front-end technologies so they need do need to work closely. We have our .js files and our .css, but...
Developers everywhere seem to be looking for different ways to make use of JavaScript libraries. Some creations are extremely practical, others aren't. This one may be more on the "aren't" side but used correctly, my TextOverlap plugin could add another interesting design element...
We all know about the big font replacement methods. sIFR's big. Image font replacement has gained some steam. Not too many people know about a great project named Cufón though. Cufón uses a unique blend of a proprietary font generator tool...
One more note. I recommend keeping your old domain for at least a year. Make sure to give users and search engines time to update.