I wanted to access https://raspberrypi.stackexchange.com/ but did not know the url. So naturally I came back to stackoverflow.com and browsed to the big list of stack exchange sites in the footer.
Then I was stuck because I did not find raspberrypi and I overlooked that more(14) link.
Therefore, I switched to meta and a search brought me to http://stackexchange.com/sites?view=list#name and there I found the link.
But given the ever increasing amount of new stack exchange sites it would be much nicer to have a search box to find and open a stack exchange site by just typing some words.