It is looking like Stephen Hyde over on the ModAco forums has come up with an experimental build of stock vanilla Froyo for the Streak. It is reported that it is not the easiest ROM to get going but if you follow all the instructions then you should be ok. The ROM is very stock Cyanogenmod with no interesting rooted elements however it is good to go and looks functional with few minor issues with 3g and WiFi.
Here is the video and perhaps if your game even give it a try. Enjoy!