We have a very powerful KB platform at work but for our group it mostly gets used for documenting processes (parts ordering, warranty service procedures, billing, communication guidelines, etc) rather than as a storehouse of knowledge for specific troubleshooting or repair procedures. We're starting to add more general training information to it and I want to start collecting and writing down all of the little tricks and fixes that we encounter, but it's hard knowing where to start sometimes.
I have a bunch of in-progress documents but all of the old stuff also has to be reviewed as well and it's tough to find time during the day to focus on it. It always seems like there are other projects that are more urgent even though I know that proper documentation will save time in the long run.