I recently created 2 blog posts with corresponding videos for the reversing of encodings.
The first one is on the ISC diary: “Decoding Obfuscated BASE64 Statistically“. The payload is encoded with a variation of BASE64, and I show how to analyze the encoded payload to figure out how to decode it.
And this is the video for this diary entry:
And on this blog, I have another example, more complex, where the encoding is a variation of hexadecimal encoding, with some obfuscation: “Another Exercise In Encoding Reversing“.
And here is the video:
Didier Stevens 
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