Tom made some behind the scenes upgrades to this system yesterday that now allows you to login with either your username or your email. While this doesn't seem like a big deal, one of the things I do the most as an admin is help people get access to the site. People sign up with fake email addresses, emails that they no longer have access to, have typos in their emails, etc or for various other reasons can't get into the system. So, this is good.
The other cool thing we're doing is standardizing the site navigation more and getting rid of the buttons on the left bar. Check out the sketch attached with before and after photos. I think this will let you get to the most used pages faster and make the site easier to use.
We're also making a few improvements to load time this week and the profiles system so people can just upload their own avatars and have it resize automatically, get it hosted by us, etc. Good stuff.