To achieve this effect in RTM I use so-called smart lists. First I assign each action one of the following tags:
agendas — meetings, public speaking and most of the things that engage other people.
calls — whenever I need to call somebody.
computer — things I can do on my computer (writing, programming, email).
errands — things to buy, bills, snail mail.
home — everything I need to do at home.
office — as above, but in my workplace.
read — articles, blog post or books I can't read now but I don't want to loose track of.