is there any dashboard (site or app) in wich you assign the quantities of each cryptocurrency (Bitcoin, Litecoin, Feathercoin, Ripple, and so on) you own, and it calculates an sumarizes the value in one currency (all in BTC, or all in USD...)?
This is a standard feature of the Ripple client at
rippletrade.com -- It dynamically calculates the total Ripple portfolio value in terms of any asset that you hold and also displays a nice circular chart showing the proportion of total portfolio value derived from each asset.