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HOWTO's are nice, but they will never be 'How do I make the module/theme I want?' documents, even tho many people expect them to be. Howto's are learning-curve guidelines, and are very valuable as such. I definately agree we should have more of those.
On the other hand, the learning curve isn't that big, once you set your mind to learning. Draven's website is an excellent example of what you can do with customising XOOPS (creating custom blocks, creating a high-end quality theme), all these require some skills in PHP, design, image manipulation and creation.
BAsically, your imagination and willingness to learn are the only limits for creating a new module or a great theme.
Herko