Bitcoin Convert is the fastest/easiest way to check BTC/Altcoin rates and historical price points against fiat currencies at a glance.
It's also possible to display the current value of your individual coin hodlings by clicking on each individual coin and accessing the detail page.
Handy links to the official coin page are also included on this page, along with current rates and current price swing indicators.
Each coin displayed shows the current price (in your chosen fiat currency) with a swing indicator.
It's super easy to check how much fiat your coin is worth, and vice-versa on the coin detail page.