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I found a nice ressource of different cheat sheets suitable for web developers at www.ilovejackdaniels.com/cheat-sheets.
It has cheat sheets for HTML, CSS, JavaScript, PHP, MySQL, Regular Expressions (RegEx), microformats and html entities (characters) in a nicely formatted one page PDF or PNG file. Check it out if you are a developer.
Speaking of developer aids: If you work with different Database Engines, check out www.connectionstrings.com for how to connect to each DB via a connector.

