Programmers on the East Coast are expected to wear suits to interviews (in my experience). On the West Coast I was told when I asked, "They'd probably run away screaming if you showed up in a suit."
In interviews, I'd dress accordingly.
Cheers, Ben
"good ideas and bad code build communities, the other three combinations do not" - [link|http://archives.real-time.com/pipermail/cocoon-devel/2000-October/003023.html|Stefano Mazzocchi]