You should just add a couple of quick links that atuo run searches for us.
Two being: Topics I've created, and Topics I've replied too.
The hyperlinks should just auto-run searches for us. So they don't actually do anything other then load the search results page for a search ran on "Topics By: [username]" and "Replies By: [username}"
Of course, that would require you to actually write a decent search feature for once.
{Really bad pic below to get peoples attention}