Mediashare link - 3.26.651.6 rom.zip
These are the Official 2.2 ROM files - they are essentially the same stuff found in the PC36IMG.zip images posted around. They are not rooted.
Here's the file listing, unformatted (file size, file date/time, file name):
85 Jul 31 03:05 android-info.txt
2482176 Jul 31 03:12 boot.img
524288 Jul 31 03:26 hboot_0.93.0000.img
6892 Jul 31 03:27 microp_v04.img
655360 Apr 1 12:30 nv.img
22806528 Jul 31 02:30 radio.img
3889152 Jul 31 03:13 recovery.img
786432 Jul 21 11:08 splash1.nb0
277305600 Jul 31 03:23 system.img
2112 Jul 31 03:09 userdata.img
7995392 Jul 26 15:23 wimax_26023_R01.img
The 2nd link is the RUU application used to flash to scratch the Evo from a Windows machine, instead of using the manual zip, bootloader process. If you have ever used a Windows mobile phone, this is that same process. You just put the rom.zip file (must be that name) and put it in the same folder as the application.
MegaUpload - RUU app
This could be used to do Part 1 of the whole rooting process. It could also be used (I believe) to possibly do the entire rooting process in one swift flash. figure this would be helpful so that we [actual devs - not me] can/could create flashable RUU ROMs like we used to with WindowsMobile phones and like we used to with the Samsung Moment and Sprint's update utility.
EDIT: The rom.zip is signed by Sprint, so I believe all the rom.zips that were to be used would have to be signed - but not sure.