From Wired article in comment section ("this issue" he refers to is the SD card problems per the article):
"An over-the-air software fix is now available (June 4) that addresses this issue. When customers activate the EVO today, they will be asked to complete the software update which will resolve the issue. You can install the update manually by going to "Settings > System Updates > HTC software update" on the EVO, then following the instructions as prompted."
Sprint Corporate Communications