I just got my first Canon D50 just a few days back.
It was suggested that we get the EF 50mm f/1.8 II for taking photos of our kids.
I'm about to sell an old truck we have sitting in the garage to start building a nice lens collection.
Here's a nice article with some suggestions, which has the lens I picked up as a recommendation as well.
http://gizmodo.com/5331109/the-3-dsl...re-youll-crave ( i a lot of info from the comments too)