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Sometimes you don't want to change anything, but you want to point out what is really strong about a piece.
It would be great if you had a message board to link to for detailed discussion - or - a better layout/set of tools for inline discussions under a piece. Sometimes discussions here get quite interesting but the comment sections just isn't full featured enough for an in depth discussion.
It's not clear to me why voting a concept down costs reputation. Voting things down is great, incredibly intelligent spam filter. It may not be an issue yet, but if this site starts generating more traffic, it will.
I do like the look of the new layout, much more compact and scannable. You may look at re-categorizing again when the concept turnover is higher.
I should mention that overall you've done a good job executing a social media niche that is much needed.

Craig - inline discussion improvements are one of our top priorities. We are planning to expand this section, add more controls (links / styling - like in post concept area), and ability to upload images in comment section.
I know from my personal experience that sometimes I want to sketch something out on top of a concept...
The voting down cost is associated with people who might be mad at the world and will go through all concepts and vote them down. The cost of 1 rep point is really small - If I feel strongly about a concept, I'll post a review, get 5 points, and use 1 point to negatively vote it down.
Not voting on a concept primarily does the same - we are even thinking about removing the vote down. Or maybe adding a "5 votes down" kills a concept or something. Hadn't had an issue with spam yet...but we'll see.
Thanks for the detailed ideas, we'll def. keep it in mind.