I have a number of 1-wire hubs. I've made my own rather than buy them.
Inside they look like this...
The DS2409 (micro LAN coupler) is mounted on a SOIC breakout board, the ds2409 is 6pin, but it fits fine on a 8pin break out.
They are tiny and the only place i know you can buy them from is www.hobby-boards.com
ascii image
0010101000011111101001101010000010011000
1110101110110101011011111010010010001011
0001011100011101111001010011010010111110
0000010111101001100000110011101100001000
0011000000111010001111111000100110000001
1010110110000000000001011001000110001010
0101100010101100000100000010100100010101
0001011001011101100011000101110111101110
0110010100110100111101110100110011111101
0010111100110011010010110010101111011011
0100000000001001001011000010110100101001
1101000111100000110111011100110111000010
1111110001111111101101001010000111101100
0010110000100000111011000000101100010110
0101111000011100111010000000011111101111
0010010011110010011101001000110101000101
0000000001000100001111111100111010001111
I've used similar box but with cheap USB-RS232 converter and simple transistor-diode summing "hub" http://img809.imageshack.us/i/screenshot23m.png/sr=1 with ownet-chart http://code.google.com/p/ownet-chart/
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