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Why are some question titles highlighted on the main page, while most are not? I had thought perhaps it was because they had been viewed by my computer, but that seems not to be the case.
Questions titles are highlighted when one or more of their tags are in your "favorite tags" list.
@Jake and @msh210 have pointed out something I didn't know in the comments: questions with tags that you frequent are also highlighted if you have no favorite tags.