Note: I'm running with MoDaCo v1.1 ROM and setup SD card for Apps2SD.
If you have your SD card setup for Apps2SD then you can just move many of the apps from /system/app to system/sd/app. They will still be available if you ever want them, easier to move back to the main on-board storage if you need too. The apps on your sd card will launch a little slower, but once launched seem to be just fine. I moved the following to the /system/sd/app:
I also moved from the /system/sd/app to the /system/app:
That fixed the google voicesearch, which I do use sometimes.
HTC Hero (SPRINT, CDMA); Rooted; MoDaCo ROM v1.1