Originally posted by K9soul
That is true and something I forgot to mention, however the risk of this can be diminished drastically if the bird is receiving a proper and well balanced diet (not pure seed diet) with plenty of fresh foods like fruits and veggies as well as always keeping a cuttlebone and/or mineral block for calcium supplementation. I lost a bird to this before I was really educated about the risks and the preventative methods . Here is a very informative and detailed site that has to do with egg binding, with links at the bottom on preventative measures. http://www.cockatielcottage.net/binding.html
You're so right. My RB Sunny died from being egg bound. She was always "chewing" on her mineral block and cuttle bone, but she would never touch her pellets. She only ever ate the seeds. I did however give her daily vegetables which she did eat, but maybe didn't eat enough of. Sunny was 5 before she tried to lay her first egg, unfortunately she died trying to lay it.

You can help them lay their egg if they're having trouble. Boiling a bowl of water and holding them over the steam can really help. You just have to be really really careful not to hold them too close to the water, the steam can burn them if they're too close to the water. I've had eggs laid in my hand doing this. Unfortunately it doesn't always work.