Copied from another forum, but enjoy!
I don't know if this has been posted before but here is the leak of the 2.1 gallery... Huge difference!!!
1. Download the apk file from Gallery.apk.zip
2. unzip the file on your computer
3. copy the apk file from that to your memory card
4. open Astro and locate the new apk file, click it and open in app manager, click install upper left corner
ENJOY! Takes about 10-15 seconds...
You can also do it all directly from your phone, which is probably easier.
BTW - you don't have to be rooted, only works on 2.0+ though.