So I was building a home-etched S3V3 board, and I had a few traces bridged (and others broken) when I went to power up the board for a test. Figured the most likely pins to be bridged would be I/O pins so those aren't too important. Well, at first it didn't work. Then I unbridged some traces that looked like it was straight from the +5v reg to a ground. Then the Power LED came on, I was happy. Except my sketch wasn't running (to control a multiplexed 2-digit 9-pin 7-segment display). Instead, the chip got nice and warm. I immediately unplugged it.
Back in my Duemilanove where it came from, no response to serial, no LED blink on reset, no response to parallel programming. Also gets lukewarm after a few minutes, barely noticeable but warmer than room temperature.
Is it bricked? :-/