Google hasn't been shy about adding more functionality to the universal search results it serves, things like weather, currency conversion, even the calculator. All of these have been getting better and more feature-rich.
The latest to get a revamp
is the currency converter which can now actually be called a currency converter.
Google has been providing answers to queries like "$10 in euro" and the like, but the new converter goes beyond that, enabling you to modify the currencies after the query is complete, along with the figures.
Also useful is a conversion rate history graph which displays the rate fluctuations for the past four years or so.
Overall, it should be more than enough for most people trying to find out how much something is worth in another currency. This also means that a lot fewer people will visit the many, many currency conversion sites and tools out there.