Merlin Mann has a new post up about how he made his presentations a little better. One of the best recommendations he has is to use Guy Kawasaki's 10/20/30 rule for PowerPoint.*
Both posts offer excellent advice for anyone who has to give presentations. Using their tips will instantly make you a better presenter than 80% of professionals in the workplace.
* - Regular readers will remember my previous post about Kawasaki's 10 things to learn this year.
I was reading last week's Economist on the metro and noted that they've published their style guide online. I'm fond of their clear, pithy style, especially after a day of reading legalese. More modern and accessible than Strunk & White, it should serve you well in all your writing.