I noticed the Canon EF 24mm f/2.8 is missing from our Lens Archive Thread. I've owned one for about 5 years and have always enjoyed it. On a full frame body it is a fantastic lens. On a crop body its still good and a worthwhile addition to anyone's collection.
First, some of the basic technical stuff.
The lens is very small and light. Similar in size to the 50 1.8 but a whole hell of a lot better built. It uses the basic AFD focus motor so there is no full time manual available. However, focus is very fast due to the small size of the lens and reasonable quiet compared to other similar lenses. It has a non-rotating front so polarizers are easy. The lens hood for it is petal style. Filter thread is 58mm.
The 24 is stellar when it comes to depth of field. At f22 you can get everything from 50cm out to infinity in focus. Even at a more reasonable f11 you can still get everything from around 1m out to infinity in focus. Close focus distance is about 25cm.
Back in my film days this used to be my go to for wide angle. Now, it has become a solid general purpose lens. I often find myself picking it up before my 17-40 as its small size make it very easy to carry around.
Photos all taken on a RebelD (300D) at ISO100 with no post processing