Web annoyances
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Don't hide your scannable content
Scanning of text is something every user does when he or she looks at a website. That's why I find it so annoying when websites try to hide their content purely for design purposes.
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Web conventions 101 - Scroll bars
Scroll bars need to look and function like scroll bars. This is equally true for flash as it is for normal html pages. Again trying to do it any other way can lead to poor usability. I'll show a very bad and a reasonable good implementation.
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Web conventions 101 - Search boxes
Search boxes should be placed at the top of a webpage. That's just one of those web coventions which shouldn't be broken. If you do this, this in general leads to poor usability.