Some time ago I started carrying my camera with me pretty much everywhere I go. That might not sound like a difficult task, after all, modern cameras are remarkably small and remarkably capable. However I don't have a small camera, my camera is large digital SLR. Some people carry an umbrella with them, I carry a Nikon.
To start with I carried my Nikon D300s with a battery grip and an expensive, big and heavy 24-70mm f/2.8 lens. It soon became apparent that while this is a very nice setup, it was a very nice weight as well. It didn't take long before the battery grip came off (mainly for size rather than weight) and a few months later the heavy lens was replaced with a much lighter 18-200mm VR lens. What I lost in low light performance was more than made for with the added versatility of a modern 'super-zoom' lens.
It doesn't come out of my bag every day, but it did toady on my way home. While walking up Kildare street past the Irish parliment I came across a group protest the bank bailout.
Off course not every photo opportunity requires carrying a camera with you. On Monday evening I was sat at home and outside this was going on. All I had to was get off the sofa, and open the balcony door, but the camera still came out of my bag. No umbrella required.