From time to time I stumble upon documents that are that good that I want everyone (every developer at least) to read them. Here are two articles that fall into this category:
NSString and Unicode
A brilliant introduction into Unicode and how it is to be used in the Apple environment. It is very useful for every developer but the examples and some of the pitfals are written with Mac/iOS in mind. Skip over these sections but read the rest.
Best Practices for Designing a Pragmatic RESTful API
The title says it all. There are long and academic articles about how to design a REST interface. Read them if there is time for it. If you are short of time: Read this one.