flickrgram
Instagram gives you a single, very very simple, view on the photos of your friends - a flat list in upload order. This is a quick hack that emulates a similar thing for your flickr photostream - just stuff your contacts have uploaded, in order.
flickrgram's output is intended for reading on iPhone, but it's perfectly reasonable on desktop browsers. I have no idea if it works in Internet Explorer.
flickrgram is written in python and deployed on Google App Engine.