Pretty much all the semiconductor vendors have a ton of data on-line.
Application notes, data sheets, design notes, examples, etc.
There is one leeetle detail....the app circuits don't always work in a practical manner. Sometimes they are only generally accurate, with details left out, or sometimes wrong (misprint, etc). And even for the majority which do work OK, you generally need to "bring to the table" some additional knowlege to make it work in reality.
That said, they are a huge help. Vendors know how lazy and also how pushed for output engineers are.
Recently I have become a big "app note whore" because I am getting into some stuff that I am not particularly familiar with. Easiest way in is to make up the app circuit and see how it goes.
If you are a "real customer" you can usually get a demo board version of the app circuit, all built and evaluatable on the spot.
The websites usually have direct links to app notes by part, or there may be a "support" area.
