The summary pretty much says it all:
To enable a "compare" button (as what you see when purchasing electronics on certain websites), which would compare the infobox fields of two separate pages using the same infobox.
If you have two articles for two camera models, using the same "Infobox camera", clicking the compare button would:
- Open a new page in a new window/tab (probably a "Special:" page)
- The new page will contain two fields (with maybe a "+" to add more), in which you may enter the pages to compare. The first field would be pre-filled with the page title of which the user clicked "compare". "Suggestions" could be enabled on these fields, just like the Wikipedia Search Bar.
- After selecting the articles, clicking "compare now" on the new page would load a table containing: columns for each article, and rows to compare each fields.
For those infoboxes that are not fully filled, a simple [N/A] or [No info] could be displayed in its place, with hover-text explaining further.
This would be a really cool feature for readers...
BTW, Happy New Year 2011! :)