Starting from July 1, for $10 more/month, you can upgrade to new Gold package: from 3.3/256 to 4.3/384. The former will be the Silver package. It will be unavailable in some areas till about August 1. Just call up and ask about the "$10 Add-on For More Speed" plan.
http://homenetworking.comcast.net/learnmore.asp#22
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