I posted a couple of pages ago an issue in which older downloads would pop up on the notification bar every time I downloaded something new.
It turns out that Dolphin HD is the problem; therefore, to resolve this issue all you need to do is clear the download list on the Dolphin browser.
Sent from my SCH-I510 using XDA
Nice! I did a little digging on this in regards to the stock browser as well - and I was able to recreate the download notification after reboot issue shrike1978 pointed out. My guess is this has to do with the DLCrutch.apk that allows for downloading of file types that the stock browser would otherwise not allow, but I'm not certain. I'll take a more thorough crack at figuring out what's going on at some point.
Is this what you are looking for?