To be honest, ANY speedtest run on Comcast is kinda shenanigans because of the "burst" they have when you first start downloading. Your speed doesn't stay at that rate constantly.
The company I work for sells ADSL2+ service capable of up to 40mbps downstream and it's a dedicated line unlike cable where you're sharing with everyone else on the node. The only downside (as with all copper based internet products) is that the farther away from the nearest central office you are, the speeds decline.
Besides having our own fiber buildouts in the works, we also recently started support for Google's beta fiber project in Stanford which is already up and running. 1gbps symmetrical service. Now THAT'S ballin' lol. The only thing is that no computer (or speedtest) is capable of getting 1 gigabit so most people see around 450-500mbps.
And on the reminiscing tip, the AOL Hip-Hop room used to CRACK. That's how I met Gas One in the mid 90's lol. Making fake accounts with CC# generators and TOS progz are my biggest memory of that shit.