A visual dictionary is an excellent way to learn or browse vocabulary by topic rather than alphabetically. The concept of a visual or pictorial dictionaries is nothing new: they've been around for a long time in technical spheres, for example.
The DK Visual French-English Bilingual dictionary, recently reviewed on the French Linguistics web site, strikes an excellent balance between range of vocabulary and avoiding too much detail or complication that could be daunting for intermediate learners. Rather than concentrating on technical topics, the dictionary covers many everyday topics such as travel, restaurants, the home, parts of the body etc, but with just that little more detail and ease of organisation compared to basic vocabulary books. As mentioned at the end of the review, modern technology means you can take the guesswork out of deciding if this dictionary is right for you. Use Amazon's the Look Inside option, and then click the Surprise Me! button to flick to a random page. Keep flicking to browse different topics and see if the dictionary looks right for you.
Interestingly, various other traditional dictionaries are also now available with this Look Inside option.