I'll help.
Hmm...I just returned from living in Belgium this past summer. I only spent a few days in Brussells and it was a gorgeous city. Obviously, it's a pretty cosmopolitan city since there are so many foreigners living in/travelling through the city while interacting with all the EU/UE offices. Most people speak at least some of all three national languages (German, Dutch, French) in addition to English and sometimes a few smatterings of some other languages. Everyone I encountered in Belgium was fabulous...very friendly and helpful
As far as websites, try:
www.visitbelgium.com www.belgium.fgov.be While in Brussells, make sure to see all the main sights: Mannekin Pis, The Atomium (sp?), Gran Plaatz, the EU buildings, etc. etc.
Elsewhere in Belgium:
Since Belgium is such a small (and beautiful!) country, I would recommend some side trips. Most anywhere you would want to go would be doable in a day trip, and if not that, then a weekend trip.
Antwerp: This is where I lived, and I absolutely fell in love with the city. Pretty cosmopolitan, but with a small town feel. Lots of fun restaurants, markets, etc. Easy day trip from Brussells.
Also: Ghent and Brugges are wonderful smaller towns that are within easy distance of Brussells. Just pick up any sort of guide book in Belgium and you should have no problem
Good luck!!