Over the years working with Magento I have built up numerous bookmarks across a number of browsers keeping a note of all my favourite snippets.
I have known for a long time that this was both ineffective and yet annoying to keep track of them all so I began writing a one page cheat sheet to keep me organized however this was just an ever lasting non searchable Google Doc. If any of you have ever used Google docs you will know how frustrating it can be. Then out of the blue I came across this cheat sheet for Laravel 4 http://cheats.jesse-obrien.ca, which in my opinion is simply the best laid out cheat sheet there on the web.
I took inspiration from this cheat sheet and began to develop my own Magento cheat sheet with additional snippets. While this is a work in progress I had uploaded it to my server to see what interest I get, I even have a section on Magerun. I plan on adding snippets and cheat sheet sections for product and category models, cart and quote methods and a full section on collections.
Would be interested in hearing what people think :)