i was playing the latest release 1.4.2 that just came out and i built myself a 2 block high coblestone wall in creative then turned it to hard and survival and the creeper blew up part of my wall.So In Summary the creeper saw throgh the coblestone wall
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if you're talking about what's officially called "Cobblestone Wall", then there's no surprise here: The creeper probably peeped through the small gap between the two tiers. (In technical terms, cobblestone walls work virtually the same as fences.)
I'm pretty sure spiders and zombie pig-men do this as well..