try Missed Call, it has custom LED colors for sms, missed/incoming calls, bluetooth, and a few other things...no email support though, also has interval reminders, 2, 5, 10, 15, 30 min, etc.
I installed Missed Call this morning. I got a screen that told me no calendar alert yet, but they're working on it.
Anyway, it did not work for missed calls if the phone is sleeping. I am not getting my sound alerts, but I am getting the blue LED. When I wake the phone up, I get my alerts that I missed when the phone was sleeping, almost back to back rather than the two minutes I have them set for.
Does anyone know what might be wrong?