If these ever get made, hopefully they'll actually contain that useful movie vice: a plot. From theforce.net:

Jon Parton sends us this update to an earlier story about the Star Wars sequels being made.
Tonight, Ahmed Best was being interviewed on a local radio station (96.5 The Buzz in Kansas City). I didn't hear the whole thing, but the dj asked Ahmet about Episodes 7, 8, and 9. Ahmet said he couldn't say anything about them. He didn't deny anything, just saying that he was under contract and couldn't talk about it. Don't know if it's newsworthy or not, but there you go.
Peter Mahyew denies the original report on his official website where says the following according to a news tip from M. Kryger:
Hi, Well, that's very interesting, but no, it's not true about Ep's 7, 8 and 9....don't know where the guy got that one...but yes, I'll be in Ep III for sure.....thanks for the email... and Cheers, Peter
Then AICN is posting rumors about Lucasfilm cutting deals until 2012 and special effects wings staffing up:
Pacific Title employees working at Skywalker Ranch have just signed new contracts to run until 2012. Pacific Title are an optical and digital effects production company and the extended contacts are a carry over from their work on Episode II & III.
Obi_Shawn_Kenobi sends us this report from Canada, who probably just took the lead from our story about Hot Dog but still it hit the mainstream there:
I was just watching "The Stars Tonight" on a local television station in Toronto. This is the Entertainment News segment of the 6 o clock news on channel 8 here in Toronto. They mentioned that Peter Mayhew has signed and has said that he signed a contract for a Episodes 7, 8, and 9! This would help validate your previous story that you though might be just a big rumour.
Troy gives TFN visitors to watch it here.
And finally, Wolvskar sends us this note from the latest issue of the Star Wars Insider. This is Mark Hamill talking about the sequel trilogy:

"I knew they were going to be about other characters with a possiblity of my doing a cameo in the ninth one."
We called Lucasfilm, but Jeanie Cole in publicity left the company recently so we're working on who to speak with next to try to get a straight answer. And we're hearing about a wish list of directors, too. Including Steven Spielberg, who is also connected to Episode III in some specific way, believe it or not.