No, this is not a joke. Comcast is putting money into a file-sharing start-up. Yes, the same Comcast that's being investigated for allegedly blocking its Internet users from downloading content from some P2P sites.

The cable giant said it's investing in GridNetworks, which uses file-sharing to deliver high-def video. In addition to making the investment, Comcast also plans to work with GridNetworks to develop ISP-friendly P2P file-sharing methods, the AP reports.