I think this functionality will be available directly within the phone app - by default it shows you the recent calls. Although I appreciate your desire to have this as a widget, and to have configurability (I doubt the Phone app will be open-source).

The recently released Google Sync solves that issue. You just have to set up Google with Mail for Exchange support on Maemo 5.

Location Based (GPS) Alarms

I need something to remind me to look at my to-do list, when I am at the applicable location.

Absolutely Brilliant I second that this is a very very good idea. Would love to see that realized!