You will get faster speed and responsiveness using Android version 1.5 Cupcake for HTC Dream, compared to Froyo and Gingerbread ROM. In the other hand, using this ROM you will not able to install latest application from Market.
This is how to install SuperD ROM on HTC Dream:
1. Download ROM files and copy to sdcard.
2. Reboot into recovery, wipe all data, flash from zip file.
3. Reboot phone.
4. Done.
Reference: XDA Developer
