I found this site a while ago... but wasnt all that keen given that at the time he barely had phone functions working! However, with the 1.5 update and others getting on board, it seems to be quite usuable.
I've only had it running for about a day, but so far it seems pretty good... once you get your head around the remapped hardware keys!!
Liking the Google Apps integration as I use Gmail
I've had a couple of "process blah blah" has stopped working errors... but the most annoying issue I've had so far is that I cannot send TXT messages to numbers in +642xxxxxx format. I have to use 02xxxxxx, which is kind of annoying given that all my contacts are in +642xxxxx format!!!

Also, I am running Windows7 64bit... getting the 64bit ADB drivers to work was a bit of a mission... but that kind of comes with the win7 territory.
The ADB commandline util for transferring files etc is not quite as user friendly as the usual windows explorer integrated type things that most phones seem to have these days... but it works.