My HTC Evo running a Custom Rom (CM6) Watch the VIDEO...

If you want to install a Cyanogen Rom or any type of Rom, you need to have ROOT. If you are not yet Rooted but want to gain Root Access, follow this Link:

http://forum.xda-developers.com/showthread.php?t=711760

I have tried using Unrevoked 3, was able to get root but was not able to get NAND Unlocked. NAND is the protection on your phone for you to be able to Flash a Custom Rom like CM6. Once you have NAND unlocked you have FULL Root. The link above is a manual way of rooting your phone. BE VERY CAREFUL. READ it as many times and understand the process before rooting. I am not responsible for your phones getting broken or bricked. But if you follow the steps as provided you will not have any problems.

So if you are already Rooted, you can find the files you need to download here. But First, make a BACK UP of your current Rom just in case something goes wrong. ALWAYS BACK UP. It is Very Very Important. I cannot stress this enough... Go to Recovery and do a NAND BACK UP and when your done Follow this link:

http://forum.cyanogenmod.com/files/category/1-stable-mod/

You would also need to download the Google Apps (gapps) file in the same web page as it will not have any Google Apps including Market when you first Flash CM6.