I take it you made this thread for honest advice so I'll give some, sorry if I sound mean.
Three columns looks a bit busy. Both columns have a little too much stuff (categories is particularly useless, should be removed or replaced with some kind of collapsible widget.) Not enough padding in the comments section at the bottom. Share widgets should be their inline versions instead of the "stacked" vertical versions. Search box isn't differentiated enough and is easy to miss.
These are all kind of small things, the overall design isn't bad at all.
