+1. I just installed HTC_IME for my 2.1 Eris via HTC sync. Wow.. it rocks... no need to pay for a keyboard app as long as you're savvy enough to install a non-market app. It supplies the missing microphone icon on the keyboard and works better than I expected. It took me a few extra minutes to get installed because I forgot that I had to switch the phone into "HTC Sync" mode after plugging in the USB cable (until then, HTC Sync on Windows XP didn't recognize the phone). I also had to allow "Unknown sources" in Menu/Settings/Applications.
Thanks,
Ken