RecordStream seems more complete but requires much more dependencies. I really like the simplicity of jsonpipe and how easy is to use it:
curl -s "http://feeds.delicious.com/v2/json/adulau | jsonpipe -s "#" | grep "\#u" | cut -f2 | sed -e"s/\"//g" | xargs -d"\n" wget -r -l 1 –p –-convert-links