I write in block uppercase, regular lower-case, and cursive, depending on whether it's an action item, an interesting personal note or bit of extracurricular knowledge to follow-up on, or something to transcribe (knowledge or command to be archived) digitally after the note-taking session.
I make liberal use of parens, square brackets and curly braces, which add additional meaning to the different styles of handwriting I employ.
Also, if there is too much to write down, several people should do notes and join their notes later in some collaborative meeting report. That's one way to ensure nothing gets lost after the meeting. For developer meetings, we frequently rised new issues in our bug tracker which were linked directly from the reports which itself were tickets or wiki pages.