Tim,
Good soldering tip. Aside from that I've got another problem with uploading a sketch:
I've bootloaded the new ATMEGA644 using an Arduino Duemilanove w/ ATmega328, I think successfully (???) since I got a "Done burning bootloader" message, but when I try to upload the standard Blink example on the Mosquino board I get the error:
avrdude: stk500_getsync(): not in sync: resp=0x00
Windows recognises the board ok and assigns a new COM port. The RX led flashed a few times when uploading. I've selected the Mosquino 1.0 board in the IDE and the right serial port, so I don't know whether it's a boodloader problem, bad serial connection or what. I've tried 2 USB cables and get the same error.