One of the complaints we've had with the beta site is that it's sometimes hard for people to find their favorite columnists. It's certainly a fair point, especially with search functionality being so erratic (yes, this is something we also hope to fix in the short to near-term).
What we've tried to do now is to make the Investment Ideas page a home for columnists. Down the left-hand side you'll find the most recent columns that have run on the site, and below that a list of our regular columnists.
Another hint, when you are reading a column you can click on the columnist name to get to a page of all their most recent columns with a bio. Same goes with clicking on the column name in the banner at the top of the page beside the words Globe Investor Beta.
One other hint on the site, if you're looking for more news on the homepage, click on 'View more top stories' under the stack of Top Stories. There you will get a history of all the stories that appeared under Top Stories for the past couple days or more.
Hope this helps.