The official Google Webmaster Guidelines have long needed an overhaul in various areas. For starters the introduction of rich-snippets has brought with it a handful of new questions – which some clear documentation and guidelines would help. Luckily yesterday Google announced their new, updated guidelines – with a set of quality and technical guidelines for rich snippets, along with specific articles on link schemes, and hidden text schemes.
If you’re in any way serious about SEO, and having your website display correctly in search engines – let along display at all – I highly recommend giving the new guidelines a read through. The last thing you want to do is have your site penalized because you were not aware of something.