[EVO 4G Q&A, Help & Troubleshooting] Saintless:
So, this has been a pain, I'll put some detail here, in case someone else could use the info.

I backed the SD card up (again, again), and then from Recovery, I did a wipe (Wipe ALL userdata/factory reset). Then a Partition, where it asked the swap size first, which I set to 0. Then for Ext2-size, I set to 1024 MB. It then said FAT32-size would be remainder.

Back under partition, I did "SD:ext2 to ext3". There was an option to do "SD:ext3 to ext4", but I didn't do that. (Info on partitioning here, if anyone needs it)

Those took maybe a few minutes each. I then rebooted the phone normally, and turned on USB Storage, and copied just the clockworkmod folder over, so I'd have the the ROMs, that were saved there.

Nothing worked, so I started over. By nothing worked, I couldn't get it to boot to any of the ROMs I had, even the CM7 that had previously been working. It would just site at the white boot screen, and never would get to the CM7 screen, or whatever one was with the ROM I was trying, even when I'd let it sit for hours. Since I first rooted this phone a couple of years ago, it would often not boot after flashing a ROM, and just sit there at the white boot screen, but when the flash was successful, I'd have to pull the battery, and the 2nd time it would boot properly. I might not be cautious enough now, but I tend to not wait more than 30 minutes before pulling the battery. Also, in the past, I've flashed a ROM, and it wouldn't boot, so I'd repeat flashing that same ROM, and it would work the 2nd time. So, this whole thing has required a lot of patience and even more time. I typically walk through flashing a ROM, wait for it to not boot past the boot screen, reboot, and if it doesn't work I still wait a while, then lather, rinse, and repeat. Just trying to get this phone going in the last month, I've probably actively spent a good 15 hours, and that doesn't count when I just walk away and leave it plugged in, hoping time will help.

Anyway, I realized that that I had made a silly mistake, and that hadn't saved the PC36IMG_Supersonic_Radio_2.15.00.01.15.zip file as just PC36IMG.zip. So I did a wipe, and then partition.

When I partitioned the SD card again, I set swap to 0, and 2048 for the Ext 2, and the remainder for FAT32.

I tried pulling the SD card, using a reader, and copying the files over, but something was wrong, and my laptop wouldn't recognize the card. I'm fairly certain that the reader is broken, and doesn't work with micro SDs anymore, so I just put it back in the phone and tried to reboot.

First time booting, it stuck on the white boot screen again, so I gave it 10+ minutes then pulled the battery, and tried booting once more. Still no go, so wiped and tried again. Still no, 2nd reboot, still no. Tried ext 3, no go.

So, I finally got to the store, since I couldn't find my other Micro SD adapter that works, to get another, and put the PC36IMG file on. I booted to recovery, it found the file, installed it, and rebooted. It stuck on the white boot screen, as expected, so I gave it some time, pulled the battery, and rebooted again.

I've been at this for the last week, and although I was able to get the CM7 ROM going a couple of times, I can't get it going now. And the PC36IMG isn't going, after the 2nd reboot. I have hope, but it's waning. I'll be doing some additional research, in between other stuff, this afternoon. But, I thought I'd go ahead and post this, since I've been writing down what I've done as I go this time, just in case someone stumbles along and knows what I'm doing wrong.