Is there any way to integrate phpBB with Wordpress. I already have a wordpress blog and I need to integrate phpBB to it. I want to synchronize the user table of both phpBB and wordpress. User can access both sites by logging into anyone of the sites. Can anyone help me on this...
You can integrate/synchronize the user tables. There's even a plugin for that, see WP phpBB Bridge.
As an aside: I agree that as a standalone forum, phpBB is by far the best opensource/free solution. For WP, there's also the excellent simple:press forum. Using that instead of phpBB is definitely more future-proof, less maintenance requiring once setup and easier to optically integrate into the site. It might look pretty ugly at first, but its css is very flexible and with a bit of tinkering, you can integrate it very well.
EDIT
It having just received an upvote, I revisited this answer. And it being 2 years old, I want to add that given recent decisions of the dev team, I feel less inclined to recommend simple:press over going the extra mile and integrating phpBB...