I'd like to see an indication that an activity (call, task, event) has a note associated with it. This could just be a check mark in a single width column. This way, when I look at my contacts page, and look at the closed (or open) activity list I will be able to see which activities have more info associated with them.
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More info: I use two types of notes, enduring and ephemeral. Enduring notes are things that will last a long time, over many calls. This may be the details of a customer's IT equipment .(e.g. Dell Linux servers or HP Windows servers) or a relationship note (e.g. this guy's wife works for the competition)
Ephemeral notes are short term, with value over only a few calls. things like issues to follow up on, negotiation information, or that the client will be unavailable for a week or two are ephemeral.
So I put enduring notes in the note section at the top of the contact page, and put ephemeral info into the call or task notes. But I need to know when an activity has a note so I remember to read it.