We need interproject links badly. I explained what I was thinking about here :
Any time, a tool bar of interproject should be found, possibly some icons. When one clicks, he goes to the same page in another project. For example, I mentioned the Fugu, with a short description in wiktionary; the biological and social description in Wikipedia, the recipe in wikibooks, and possibly a whole set of images/sounds... in wikisources.
T57070: Interproject interwikilinks -same option e.g. for Wiktionary-Wikipedia