I didn't realize how easy it was to change between animations in any rom you are using...till I found this thread at XDA.
There are several animation files posted in that thread. Videos of what they look like also. Simply copy the /system/framework/framework-res.apk from your EVO to your PC. Open in 7zip and replace the anim folder in the apk with one from the thread. Then push the file back to the phone while in recovery.
I recommend the flip animation. Just changing the animations really enhances the experience.
There are several animation files posted in that thread. Videos of what they look like also. Simply copy the /system/framework/framework-res.apk from your EVO to your PC. Open in 7zip and replace the anim folder in the apk with one from the thread. Then push the file back to the phone while in recovery.
I recommend the flip animation. Just changing the animations really enhances the experience.