Remove pcmanfm-qt4, it's no longer supported by upstream
Remove peppy, it's been 100% dead since 2010
Add rxvt-unicode-{variants} to the blacklist

This is only one application, and if you're technical enough to use rxvt and
need a specific number of colors, you're probably capable of using the terminal.
Remove PortMedia from the metadata

It's been dead for a very long time indeed.
Remove stardict from the metadata

The last release was in 2007, and is maintainerless.
Add superkaramba to the blacklist

It's 'An engine for cool desktop eyecandy' and thus not an application.