What do I need for programming ATtiny25?

[RMM]

Or you can program it with a breakout board before reflowing it onto the board.

From the Oshpark Projects Thread

@RMM

This board should be useful for testing and programming the "tiny" attiny13a (MMU). It is labeled with USBAsp pins for easy hookup (I always mix up at least one pin every time I wire up a new programming clip! )