Dear PortableApps.com Dev's,
I have had a good look at GoldenDict (http://goldendict.org/) It's probably the best freeware (or opensource) dictionary app available. IMHO it is crying out for a launcher. It is inherently portable, just requiring a directory named "portable" in the main GoldenDict directory (see the FAQ).
I have had a good look at StarDict, as well as a few others. GoldenDict has an excellent GUI, and can manage a wide range of dictionary formats, including Babylon and StarDict.
PortableApps.com really needs a good dictionary app. This looks very good to me.
Just my two cents worth.