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There is no phone company I know of that will replace a cracked screen on a phone as a warranty issue. They all consider customer physical damage. If you're lucky, they'll tell you about the repair service offered by the manufacturer. If you're unlucky, they'll convince you to buy a new phone for about $300-$400.
As to doing the repair yourself, it's very possible but you do need to be careful. As AZwldcats points out, the digitizer is taped directly to the LCD underneath. If you're not extremely careful, it's pretty easy to crack that LCD and then you're looking at another $60+ part to buy. I highly recommend the use of a heat gun or hair dryer to help loosen that adhesive up.
One other thing to be careful of is that screen is so big that it tends to bow in the middle and the glass actually touches the underlying LCD. If that happens, you'll end up with what looks like a "puddle" of water under the screen. I recommend doubling up on the side adhesive you use to get a little extra space in between the glass and the LCD.
If you'd prefer to not do it yourself but want to save some moeny, HTC will actually do this repair for you. It will take about 2 weeks and they charge $140 for the repair (I just called to confirm that). You can reach their Sprint non-warranty repair center at: 1-877-293-0807. They also have a non-warranty website which you can Google for.
If you want to get it done quicker and for less money, check around for a local cell phone repair shop or, if you don't have one in your area, you can do a Google search for a mail-in company. They should be able to do it while you wait (in-person) or under 48 hours (mail-in) and should charge less than $100.