When introducing people to Hubski I have repeatedly run into three complaints/small annoyances. The first is that the URLs aren't "pretty". There is often a "?id=" on URLs, which only saves four characters when removed, but it's an annoying four characters. Obviously, I don't know how your systems work so I assume this is more complicated than a bunch of RewriteRules. A few past posts indicate that it's not that simple.
The second is that the number of comments is far to the right of the links, tags, and so on. This doesn't bother me, I like the spacing. But it is annoying to some. I guess the way to fix this would be move it towards the other information. Maybe make the whole column thinner based on the max title length. Opinions?
Finally, a live preview of how your markup will look when finished would be nice. Although editing afterwards works just about as well.
Thanks for considering these.