Regarding recall from long-term memory: Write it down!
I know a person who actually does that. That recall and precision is greatly improved should be obvious. The problem lies more in acquiring the habit of actually writing everything down if it looks important.
I envision to build something electronic for me, because I hate handwriting. Also that would add search capability.
Regarding recall from long-term memory: Write it down!
By this, do you mean that the act of recording the information will itself improve recall, independent of later reference to the recorded information? I recall hearing at least anecdotal evidence for such, but I'm not sure how well documented the effect is.
Of course, even without such an effect writing important things down in general is a good habit to acquire.
Transhumanists have high hopes for enhancing human cognitive abilities in the future. But what realistic steps can we take to enhance them now? On the one hand Flynn effect suggests IQ (which is a major factor in human cognition) can be increased a lot with current technology, on the other hand review of existing drugs seems rather pessimistic - they seem to have minor positive effect on low performers, and very little effect on high performers, what means they're mostly of therapeutic not enhancing use.
So, fellow rationalists, how can we enhance our cognition now? Solid research especially welcome, but consistent anecdotal evidence is also welcome.