A HTC Hero OTA (Over The Air) update has just appeared on the HTC support site. According to the details this is a..
"Firmware over-the-air (FOTA) client update & YouTube player Update."
Is it the Android 2.1 update ? Well, it certainly doesn't look that way. It'll update your device to "2.73.405" and is available by going into the "Updates" section on your phone. Let us know what other improvements you see after the update!
Link - HTC support site