Have seen a few names from here pop up in my inbox over the last few weeks.
Thanks for supporting the project :-) From what I'm hearing back it's all good. There's now about 50+ of them out there.
For anyone that's interested in one of these PS2 mouse interfaces, they're up on eBay here;
http://cgi.ebay.co.uk/Atari-ST-PeST-PS2-Mouse-Interface_W0QQitemZ8710374530
I have the PCB's to make about 12 more before Chris/Exxos and I make the decision to buy another 100 boards depending on how the figures look.
Further details here;
http://www.retro.dial.pipex.com/pest/index.htm