<p>I'm not sure if many people know about this text-editor?</p>

<p>jEdit was kinda big in 2004, but now, Notepad++ seems to have taken the lead(on Windows)
Many of the plugins haven't been updated since 2003 and the overal layout and usage is confusing...</p>

<p>I'm sure jEdit has many nifty features, but I'll be damned if I can find out where to find them and how to use them. Reading that manual is a fulltime job on it's own.</p>

I had to use during my vocational education for XML and XSLT. It had a lot of bugs and didn't work always. I couldn't get to like it, but if I had to test some XSLT I'd give it another shot. I found Notepad++ and I am more than happy with it for what I need.
To your question: Did you take a look at
jEdit's plugin list
? There are some plugins released 2008 and the latest version was released on 8th August 2008.