IME, the most useful tip is "maintaining the context outside your head". The article recomends a "running comment". I use a notebook, but anyway I find it efective.
A stack of Post-it notes is amazingly useful! IDEs need something like this. Just a command-key sequence on whatever, and a box pops up for a quick annotation, press return and it's saved. (Cue someone telling me that it's already a plugin in Eclipse.)
