If you have ICS on your phone and its rooted here is a way to get Google Now well erm now.
See XDA for full how-to but its as simple as:
- Open Root Explorer & navigate to /system
- Now Open build.prop in Text Editor.
- Edit ro.build.version.sdk = 16 & save.
- Now go to /system/app & Rename GoogleQuickSearchBox.apk to GoogleQuickSearchBox.apk1
- Now reboot & install the app from the download link.
- Now edit build.prop & change ro.build.version.sdk = 15 & reboot.
1st release with no voice but its a start.