If you want change official Hero bootscreen and put official NexusOne bootscreen follow this little tutorial:

1. Extract the RAR files and put in root SD card ZIP file (except the one called "by-shenshang")
2. turn off device
3. turn ON device like press and hold Home & Power button when you don't see Android system recovery menu
4. then choose apply any zip from sd and follow instructions

download what you need:
Hybrid With BootSound
Code:
http://rapidshare.com/files/324033114/Hero...ound-signed.rar
Hybrid Without BootSound
Code:
http://rapidshare.com/files/324033116/Hero...ound-signed.rar
NexusOne With BootSound
Code:
http://rapidshare.com/files/324033751/nexu...ound-signed.rar
NexusOne Without BootSound
Code:
http://rapidshare.com/files/324034719/nexu...ound-signed.rar
With Sound:
Code:
http://rapidshare.com/files/324119286/Stoc...creen.Sound.rar
Without Sound:
Code:
http://rapidshare.com/files/324119285/Stoc...een.NoSound.rar