Apart from what an awful friend she was to Brooke (ie. cheating with Lucas), I loved Peyton in season 1.
I loved how bitchy she was to Nicki:
'All the eyeliner in the world isn't gonna make you anything other than a psycho stalker'
'I asked you if you had a problem?' 'Yeah I do, it's called you, bitch!'
'Something smells skanky around here' 'Oh yeah, I smell that, and I think it's coming from you!'
(or something along those lines) haha.
And I love Jeyton in this season <3