Neat. I'm not really into her music, but she seems like a pretty cool person.
I've met Neil Hannon, who is reasonably well-known in the UK and Ireland. He was understandably taciturn, but we still managed to get an autograph and a Twix bar from him.
Met Linkara (The comic reviewer from atop the 4th wall)at a convention, not at a panel or anything, I ran into him between events at the arcade, the dealer room, and later the concert hall.
Sadly I hadn't watched any of his videos but I was able to BS my way through the entire conversation, one of the nicest guys I've ever met actually. He liked my Travis Touchdown cosplay even though he said he wasn't sure what it was (just thought the beam katana was cool). we joked around and talked about the band that was playing and then staged an argument just to see reactions. Wish I could meet him again now that I've watched his reviews.
Oh and when I was around 8 or 9 I met the Big Show (The wrestler, I think he changed his name recently) but dear god someone over 7 feet tall looks even more huge when you're a kid
ive met darren shan (an author) twice (once at a book signing with a bunch of my friends, once at a book festival reading with a bunch of other authors). he's pretty laid back, but you would expect that if you read his books, and heard that he says his love of (and writing of) vampire/demon-based books is because he was born across the thames from the houses of parliament.
A friend and I met Eddie izzard when we went canvasing for labour. My next door neighbour's sister runs for mp in didsbury, so I usually get roped into handing out flyers ect. which is why I was there when he turned up. My neighbour later asked her sister if he remembered us and apparently he did, as "those guys who looked like harry potter and ron wesely"
(I wear glasses and my friend is ginger)
I met Dirk Nowitzki one. He was goddamn tall, and really nice. I felt bad though, because he was with his family.
And I met Seth MacFarlane. He's even funnier in person.
I also talked to the lead singer of the band Edguy for about an hour and a half after a show they played with Kamelot. One of the nicest guy I've ever met.
And I've met and hung out with the whole band After Midnight Project.
My mother is the person to talk to about this though. She's a flight attendant, so she meets a lot of people. Hulk Hogan, Jake Gyllenhaal, Eminem, Joe Montana, etc. etc. She's met a lot of people, and I've got a lot of autographs (a lot of wrestlers actually).
I've met Mike Doughty and Adam Richman. Mike Doughty was in stunned silence because of my chatty autistic brother being there, and Adam Richman was very personable. Dunno if this counts, but my late great-uncle (I think that's how he's related to me) was Marion Tinsley, who was considered the world's greatest checkers player. Never met him, though.
EDIT: Since people are putting down who their family members have met, I may as well do it too, just for fun. My mom's met Diane Kruger (from the National Treasure movies) and Joshua Jackson (from Dawson's Creek) at the wedding of two of her gay friends, and she worked with the wife of Jack Emmert, the creator of City of Heroes. My mom told her that I wanted to play the game, and so Jack sent me a year's worth of free game time and a t-shirt. My dad got a marshmallow smeared with paint from one of the members of the Blue Man Group when he went to Vegas. And then my step-grandfather went to college with Halle Berry's mother, and apparently held Halle's hand when she was three. He also claims to have met Charlie Chaplin and various others.
I met Telle from Benidorm... she turned the Christmas lights on in Cannock. I have a photo. It was a very lackluster encounter as I'd never watched Benidorm, but my sister was quite psyched. I also met Miles Kane and Alex Turner when The Last Shadow Puppets played at the NEC. Now that I was happy for!