Hacker News Reader

Doesn't do columns, but does do multiple tabs. I was reluctant to switch to tabs from columns too, but it's my preferred Mac client now.

Also supports a "mini" tweet view which makes it work more like an email client. http://yfrog.com/oerabxhp

I am beginning to see some advantages. Still struggling with search (is there no "or" operator?), but I'll try it out for a while.

Have you tried uppercase 'OR'? I found that worked.

It works in the normal search, but I want an extra tab that shows the results of a fixed search. Couldn't get that to work yet.