My cat, Toby, died on April 24 of 2009 and I miss him so much. I had great times with him. Whenever I said "roll over", he would roll over. I thought it was cool.
On April 23rd, he was meowing at my window. I checked on him. He was not looking good. The next day he died. It was breath-taking.
Everyone with a cat, please spend as much time as you can with him/her. You won't feel as bad when you lose them if you took as much care of your cat as I did of Toby.