Mine are,

Series 1 -

Bessie Curzons semi final as Mary Poppins.

Series 2 -

George Sampson semi final/final Singing in the Rain.

Series 3 -

MD Showgroup Audition and Diversity Final routine.

Series 3 -

Diversity semi-final routine. I loved it.

(can't remember all the acts of the other two series)

Series 1 -

cant really remember any of them tbh - probably the bar wizards final

Series 2 -

George Sampson semi-final (was better than final imo)

Series 3 -

Diversity final

Signature audition

Gregg's "Nessum Dorma"

Diversity's Final performance

Can't remember the other shows, but this show, Susan's, Greg's and Stavros Flately's first audtions.

Yeah, Signature's audition - favourite ever! and Diversity in the semi, where they threw Perri across the stage - awesome!

Series 2 - George's LAST performance of Singing in The Rain

Series 3 - Aidan's semi-final performance OR Diversity's final performance.

Yeah I also loved Greg's and Signature's auditions

I'd forgotten about Signature, so yes them too, and loved that Hoop la la.

Susan Boyle's first audition.
Paul Pott's first audition.

Series 1 - Bar Wizards audition
Series 2 - Andrew Muir - Rewind audition
Series 3 - Diversity audition

(And on a slightly unrelated note: http://www.songphonic.com/Andrew.htm yaaaaay!)

Last year was probably Signature Thriller.

This year probably Natalie Okri doing Alicia Keys.

Didnt watch the first one.

First year

Paul Potts, or Damon Scott auditions

Last year

Escala - audition, semi and final

This year

Diversity - Final

This series ;

Susan Boyle's audition

2 Grand in the semi final

I just find DJ Talent too funny!

Definitely not the "best" though - would have to think about that, although the OP did ask for favourite rather than best anyway

xxxx

I didn't watch Series one.
Series 2. Kate &Gin.
Signature.

Series 3. Shaheen. Every performance, I just think he is very talented, maybe the choice of songs could have been better but he didn't play safe and always gave a polished performance. A funny thing to me is that despite the fuss about his CV and the fact that he had been in this and that I had never heard or read anything about him despite living close to the area where he lives, in discussion with other people who had watched the show it seems they hadn't either.

Diversity. A fan from day one.

Natalie Okri. Audition. I still think its sad that such a talented little girl didn't get a proper chance to show how good she is.

I think the kid is astoundingly brilliant to be honest, unfalteringly reliable, wonderful technique and despite all the fuss around the show kept out of the spotlight, was refreshingly honest when he wasn't, and especially with all the hate about his background, just got on and did it, sung well when he was asked to, even in the semis when he could hardly speak, whilst at the same time appearing to be just a normal boy of 12 and not a stage school brat. He is destined for stardom, he could probably have it now, but even if he doesn't he will make what he wants because he has the desire to. Most of this also applies to another boy of 12, who given the circumstances (on another thread) also did very well.

Paul Potts audition
Signature audition
Diversity final

Serris 1 cant realy remember
serris 2 George Sampson final
Serris 3 Flawless Smei final and Diversity final

Susan Boyle's final performance...

not the fact it was anything spectacular, but it was a performance which nearly brought me to tears...can't say that about any other reality tv show performance!

Air-O-Smith with Piers

Probably the most entertaining performance i've seen at the auditions this year.

http://www.youtube.com/watch?v=c-LcxO43Rpo

Susan Boyle's final performance...

Never watched BGT before this series and probably won't watch it again

Susan Boyle's audition will be the lasting memory, but...

Without doubt for me the most enjoyable performance was Diversity in the final.

Diversity in the final - bl**dy brilliant!