i2c to 1-wire bridge

I always wanted to play around with 1wire a little, so I spent the afternoon building first a Parport-to-I2C and then a I2C-to-1WIRE adapter part of which you can see in the picture. It works, but it is s....l....o....w.....! So I think I should have spent 35€ on a Professional USB to 1WIRE interface instead.
Update 29-03-2007: I got the DS9409R today, and honestly it sucks, too.