Good writing should be like Alan Partridge -- business casual
Writing a computer or other "how to" book, you walk a tough line between too formal and too informal. It's not easy to stay balanced.
Try to write in a way that it friendly, approachable, and shows some personality -- without imposing yourself too much on the reader. Think of how traditional chat show hosts create a rapport with their subjects, while retaining a respectful distance and letting their guests focus on themselves (something for which their guests need little encouragement).
Don't use stiff and starchy language. Use contractions (we're, let's, I'm) when appropriate. Don't use too many stuffy words that normal people only see written down (ergonomic, leverage, functionality, pedagogical). Write in a way that sounds good when you read it out loud.
But don't use slang either. Spare words like "cool" and "rocks". You're not Ali G and there's nothing worse than a teacher who tries too hard to get down with the kids. It doesn't make them seem credible -- it means they lose the credibility and authority that they might naturally have.
Dress your writing in tie and tank top. It's a good look on you
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