Threads like this should not be posted in development. This is general, where posts like this should be made. Moved to general as not development.
Secondly, a search of the forum will reveal this question being asked and answered countless times by various people.
I shall repeat the answer on this occasion.
Nobody yet is working on a sense froyo ROM for the hero. If/when a suitable device gets it (mytouch 3g slide or possibly wildfire/legend) a port will be attempted.
The device needs to be based on the same ARM architecture as the hero.
No froyo yet uses this.
Please search before posting as per the forum rules.