So, using Google tonight I noted, in the results page, some links get duplicated among two bars, one anchored at the top, and a second one below the search box.
You can compare the initial page with the results page. My links are in portugueses, but basically you get two Search/Web, two Images, two maps, etc...
Here's the images:
I also noted this is not consistent with the maps page:
When is it a good practice to keep two bars in the same page? I mean, what characteristics would make a page one candidate to have duplicated bars/menus/links?
And why is it not duplicated at the maps page?