According to h1-siri.com the first version of H1Siri was just a test version and was not suppose to be released but it got leaked, which is why the servers stop.
"19/12/2011 The beta version of H1SIRI is
ready! it will be available in a few days, we recall that this open
source and legal version it will be possible for :
iPhone 4 iOS 5.0 / 5.0.1 with WCDMA
CDMA iPhone 4 with iOS 5.0 / 5.0.1
iPhone 3G with iOS 5.0 / 5.0.1
iPod touch with iOS 4 5.0 / 5.0.1"
visit h1-siri.com for more info and a video of it working on a iPhone 4.