There used to be a fairly popular PalmOS4 (and earlier) hack known as Megawiki. This allowed the insert of hyperlinks between any record on the Palm OS and any other record on almost any application. Here is a description: Mega Wiki After looking for a similar app in the Android Market without finding one, it looks like an opportunity to bring a new app concept to the Android (and one I found very useful). For example, I was able to link a doctor's addressbook listing to each of the appointments in the calendar, and the medicines prescribed & test results in my notes application. I also used it to link events to other people, merchandise purchase info to warranty and service contacts, gift shopping lists to people, todo items to the people to notify, delegated tasks to the delegatees, and other cross-application references. I don't think I'm the only person who would find this interesting.