If you spend entirely too much time (how could that be?) keeping up with things in your feedreader of choice, you might find the services of reminderfeed to be valuable. Basically, you set a date, time and description, then use the subscribe buttons to have your feed-based reminder delivered to you.
You could always use this in conjunction with alerts function at Yahoo to have this reminder delivered via SMS to you mobile phone. Perhaps that will be a option directly from reminderfeed in the future.