Yes.
FWIW, I'm on a 3Gs on 4.0.1. Reminder opens and configures fine for me, it's just that the repeating alerts don't work (like setting an alert to sound every 5 minutes until I check the incoming SMS).
But, the status bar alerts otherwise work fine (except for the Vibrate On/Off switch setting that can also be set to display it's status in the status bar).
Notifier is almost always updated 'late' after a jailbreak is released. As far as I remember, the dev also writes iBlacklist (a paid app), and once iBlacklist is stable on the latest iOS that's jailbroken, he's always turned his attention to updating Notifier (here's hoping he does again).