Dekker XP x64
Using eXP's last session.ini from the latest Xmas 2008 TinyXP this is Dekker's beautiful effort and a blindingly fast x64 based Tiny XP. In a nutshell he has used a theme pack, added some hotfixesand whatnot from ryanvm.net and a few reg tweaks from Planet64.
A little bit of fine tuning and personalising for one's own system and it rocks man.
If speed and power are what you are after then this is the baby for purists!