The eBook reader didn't widen my world in terms of genre (I still read a large variety of books but still don't read science fiction
).
However, I do read a lot of books that would've sat in my "to be read" pile forever in paper. I used to buy a lot of paper books out of interest but would keep putting them aside simply because of the font type/size or size of the book . (I often start new books at night when I am tired from a dy at work). Because all books look/feel the same, this factor has disappeared.
Also my delivery of the NY Times-Late news updates and Newsweek has increased my reading of current events beyond the local paper.