In case you missed the GameSpot Annual Marketing Event at Moscone Center last week (also known as the "Games and Music Experience"), Lore Sjöberg has a write-up at Wired to tell you what you didn't experience. (The SFist Tech Labs staff didn't go, as we were afraid that 50 Cent would be there, and let's just say there's some bad blood between us.) Speaking of bad blood, Yahoo announced it would undercut eBay-owned Skype......