On my 10.4.9 system though, I get the borderless look, but brushed metal is still around, whereas iChat Borderless's screenshots clearly show the dark grey Unified look. Anyone else care to chime in?
Personally, I still prefer the old iChat mod that Dave Caolo found last summer. Sadly, the post at MacThemes Forums where this mod apparently lived exists no longer. Still, if the Leopard delay means you're jonesing that much worse for an update to iChat's aging UI, iChat Borderless should tide you over.