How much fun they are
You get to see all kind of interesting questions.
For example last week it was:
"What is POJO" for 50 times when they did a hibernate forum special.
This week I was suprised to see 20 new posts in the JBoss forum (usually there are 3) until i realized they were promoting a book.
Ofcourse now the most popular question there is:
"What is better JBoss or WebSphere"
Good thing there are book promotion so people can ask the really tough questions on their minds...