A few more precisions about Belgium:
1. The Northern Part is called Flanders (Vlaanderen). There people officially speak Dutch. The term 'Flemish' refers to an important difference of accent and vocabulary with Dutch. Whilst Dutch is spoken on TV and understood by everyone there, there are people who speak it differently, and they like to name their language "Vlaams" (Flemish)
In Flanders, many people used to speak French (since it used to be the only official language of Belgium, and since it is a fact that french is a more powerful language). Yet less and less Flemish (want to) speak French. The majority of Flemish can speak English -very well- as it has become a very important influence on TV (films are not dubbed) and in the society in general.
2. the Southern Part is called Wallonia (Wallonie). In this region, people speak French. I insist that they do not speak Walloon (!)
Wallon used to be a very common dialect there and is VERY different from French. Whilst people in Flanders carry on speaking Flemish, people from Wallonia don´t.
In this Southern part, people are becoming concious that they should learn Dutch (as it is spoken by more than half the country's inhabitants, and as Flanders is definitely more dominant and strong in term of economy and industry). French-speakers in Belgium do learn English, but they do not seem too concerned about it (unlike Flemish people).
3. The Eastern part of Belgium is a territory given as a present from Germany to Belgium, after the war. In this very small region, people officially speak German. However, it is considered as a 'facility' region, in which French is commonly used too.
4. The Brussels DC region is officially bilingual. There all official signs and notice boards are in both French and Dutch. It does not mean that people speak both languages. However, they are very encouraged to speak the second language (strong language programmes in education for instance) and it is a fact that people in Brussels are more likely to speak both languages than people from other parts. Following the development of Brussels as a European district -and thus the arrival of many other Europeans-, people feel that learning English is a necessity and they are also more open to other languages.
This is my view, as a French-speaker (and language teacher) who lived in Belgium until last month and studied in Wallonia, Brussels and Flanders.