This is a really big deal - now you can evaluate gateways purely on their technical merits, then go and find the best deal on the (commodity) merchant account. If you're using ActiveMerchant on Rails, then you really can find great deals since you'll even be indifferent to the gateway (incidentially, AM is why I'm learning Ruby instead of Python).
If you need to do numerical analysis in a scripting language, you pick python because it has numpy.
I once had to make a QR Code reader and writer back when it was only seen in Japan and the only library available was for Java, so I picked that.
Recently I had some ruby code that parsed a file, but I needed to pump it into a proprietary database with only a JDBC connection... so I picked JRuby.
Often picking a new language is much easier than rewriting a particular library.
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If you need to do numerical analysis in a scripting language, you pick python because it has numpy.
I once had to make a QR Code reader and writer back when it was only seen in Japan and the only library available was for Java, so I picked that.
Recently I had some ruby code that parsed a file, but I needed to pump it into a proprietary database with only a JDBC connection... so I picked JRuby.
Often picking a new language is much easier than rewriting a particular library.