Shaving down times

I love reading all the stories about how much people have improved and how much they have cut down their times. It's very inspiring and encouraging. But as I look at my own times, they don't seem to be coming down. They have dropped about 5 seconds since I started swimming again three months ago, but they have kind of stopped dropping. This is frusturating considering that I feel my form has improved dramatically. So basically I was looking for everyones secrets to making times come down. I work hard, I swim everyday, and it seems no matter what I do they just won't move. Any ideas would be helpful!! And keep up the good work everybody!!! ~Kyra p.s. my 50 SCY free is about 40 some odd seconds..sometimes in the upper 30's (horrible I know)... and I want to be able to do it in at least 30 (lower) something, but upper 20's would be awesome.....most the rest of my strokes are the same time except for breaststroke which is slower.