Here comes a list of ideas:
1. First you should define who your audience is. Keep in mind, very
good tutorials have been made already - so if you want to add value, you
have to explore uncharted territory. Login is a start, but it will not
win you a Pulitzer prize...
2. I think you should analyze this message board...it will tell you
what people are struggling with at various stages. Add to the mix, what
you yourself have been struggling with.
3. Make sure that what you write about is not hear-say (or "read
somewhere") but actual experience. You will need to back it up,
reproduce cases, etc. You cannot teach what you have not experienced. In
other words, don't try anything abstract.
4. On a positive note: I think you could write an entire tutorial on
how to best use the DataGrid control. It's a highly complex topic, with
plenty of depth to dive into.
5. On a lighter note, a good movie about teaching is the recent DVD
release of "Guardian". I am mentioning it because I think it illustrates
the importance of experience.
Other than that, good luck - and hopefully a good tutorial...
