Through Vinu I found out about a great tool for javascript, HTML and CSS work. Aptana is an Eclipse-based editor for javascript, HTML and CSS making use of Eclipse's great set of features, specifically tweaked for usage with earlier mentioned languages. Very nice also is the fact that they also have a download of an Eclipse-plugin, so that when you already work with Eclipse, there is no need for you to install the full Aptana package which also contains Eclipse basically.

Very nice. I don't really use Eclipse a lot, being a Zend Studio user for PHP work, but a good HTML/CSS editor is very nice, and maybe this will also trigger me into javascript a bit more ;)