Rafael Fischmann wrote:

It’s not that strange, Rainer… you have changed your phpBB settings to redirect to this weblog page whenever a user access your viewtopic.php page, something that doesn’t happen when you access viewtopic.php in a default phpBB installation.

That’s not what I did; I just made my weblog topic the default topic. Since 99% of accesses to my forums are to my weblog page, that should make little difference – at least in terms of traffic. Then again, Google doesn’t measure traffic.

Anyway, since the topic argument is not a part of the URL proper, but of the arguments (the part after the ‘?’), Google shouldn’t consider that for relevance either…