For forums based on phpBB, you can also apply for blog space. It's said that there are no ads and the interface is quite refreshing. Here's their introduction:
longluntan - advanced technology, powerful functions, completely free, fast and secure:
Chat room + album
Calendar + welcome page
Role-playing game mode
Instantly own your own personalized domain
Personal email
Unlimited forums
Safe and stable
Automatic upgrades
PHPBB2 - PHPBB3
Free online image access