Does your iPhone look like the picture on the left? If the phone is still working, the lcd screen is still good and just the glass cover is cracked. Are you a DIY kind of person? If a 10 year old can do it, then a fix it yourself kind of person may be able to do it too. Just order a kit from a reputable online store and watch the video.
There are also stores and people doing these repairs all over the Bay Area. Go online and search for "iPhone screen repair".
Here are a few links that can help you.
Boy fixes cracked iPhone:
3G cracked Glass instructions and video:
One of the repair kit from Amazon:
