I have an LG Vortex and managed to end the double notifications the day I installed Handcent. My issue is on the lockscreen. If I'm away from my phone and receive text messaged, I can look at the lockscreen and it will say "3 messages" or however many came in. The problem is I can't clear this number because the phone seems to only check the stock sms for unread messages. I let them pile up for awhile and when I want to clear it, I have to open the stock sms app. I don't have to actually select specific messages, only open the app. It's not that big a deal. More of an annoyance. I don't even know if other droids have the lockscreen notification.