mlr

I was determined to learn at least 1 new technology for work this summer. I picked XSL-FO - not the most complex but extremely useful, and I didn't have any experience with it. It is quite nice that you can create graphic files, HTML, .pdf, .rtf, postscript files, etc. with just one formatting syntax.

Next on my list (hopefully by Jan 1): BIRT, EJB3.