I have a Wordpress (WP) two-column blog layout. What do you believe is the best content to place in the WP side column? I've got an ad at the top of the side column. Below that, I'm wondering what produces more continual hits on the blog and keeps people on the site? I've seen blogs that have 'archive' box where they list the months/year as a category, and blogs that have 'most recent posts' and blogs that have tag clouds. To me, it seems the 'archive' box that shows categories as months/years would not attract as much user attention as something like a random listing of previous articles on the blog. Any experience or advice would be greatly appreciated. Thanks.