Re: How do I remove a large number of spam forum posts?
I think what xavi meant was to use the 
"Delete Selected Topics" option, after checking all the boxes in front of the titles you wanted to delete.
The number of forum posts displayed can be changed in Admin > Forums, "Default number per page:".
If you did not allow attachments, then you could use phpmyadmin to delete all the posts by a user. The forum posts are kept in the tiki_comments table. In the SQL tab enter:
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delete from tiki_comments where userName = "the user name of the spammer";
If you allowed attachements, I am not sure what would happen to the orphaned attachments if you deleted the posts that way.
Tom
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