Is there any good tutorial to write custom login, registration and password recovery forms?

I like to have login and password recovery managed by my own forms and embed them into my theme.

I’m using the well written Jeff Farthing’s plugin “Theme My Login” on some of my projects. But I would like to write my own custom functions and avoid the use of a plugin.

However I would also like to learn more on the process of making custom forms for logging in. While I might spending some time dissecting the plugin as suggested in an answer to a similar question (How to create custom LOGIN and REGISTRATION forms?), I would like to know if there’s any good tutorial, wiki or codex page which I might have missed that digs more or less deeply into user forms writing to have a better understanding of the subject.

I’d rather have the answer “no, there isn’t any” than just “stick to the plugin”, which is kinda obvious and repeated – after all, me and some others reading might have missed something different and new such as a well written article or tutorial.

cheers!