Yesterday on Marketplace appeared new app from Microsoft Studios which in my opinion is must have for any Windows Phone developer! It is called Dev Center: http://www.windowsphone.com/en-us/store/app/dev-center/2d3063c2-4b29-4e69-9c03-50b67b0e6aec
It contains subset of functionalities provided by https://dev.windowsphone.com/en-us portal. To be accurate it provides you possibility to view reports about your apps. It is quite obvious that you can’t publish app via it as this would be non trivial challange 
Most important features, beside download stats and applications list is that it gives you possibility to filter by download type (none, free, trial, paid) and translation of reviews. The last one is great as allows you to response for users feedback much easier if reviews are not provided in English Remember – you are creating apps not only for your country, but for the whole World
