Q:

Is there a hosted SVN provider that offers discussion tools on par with GitHub's?

We use SVN at work (ie. this is not an open-source project) and have an off-shore team working in our code. I'd love to be able to communicate better with them and the commenting system provided by GitHub would be perfect. 
With GitHub's system I can start a discussion on any line of code in a commit.
So, my question: does anyone know of a hosted SVN provider that has a similar tool?
To be clear, I'm looking specifically for discussion tools that allow convenient discussion about the code. The GitHub tool lets you start a discussion on a line of code in the source browser. 
I'm not looking for a formal peer-review tool, but rather a discussion tool designed to foster conversation about the code in a commit.

We are using Assembla currently and they don't offer this sort of functionality in either the Trac repository browser or their home-grown repository browser.

Example on YouTube

A:

It would not be hosted, but you can setup the open source version of the Google Code Review tool previously noted by @SilentGhost which is named Rietveld:
http://code.google.com/p/rietveld/
As is, it runs on Google AppEngine.  You could host this yourself using the AppEngine SDK and Apache's mod_proxy, though I wouldn't recommend this if the site is to be publicly visible as the SDK clearly notes that it is not meant for production and as such security is lightly considered.
Alternatively, Google has also released a tool for converting AppEngine applications into pure Django applications, which you could then host via your favorite python web run time.  On top of this, the demo application conversion that's included is actually Rietveld so they have already taking care of this for you.  See here for more info:
http://code.google.com/appengine/articles/pure_django.html

A:

Any hosting that provides access to Python. You can use Trac with discussion plugin

