Longhorn 4074 "Optimization"
I say “optimization” because this may remove features that could be important to you if you are a developer, but the authors of the pdc Longhorn Optimization Guide, under the noms de plume Chris123NT and Nighthawk, have written another one for build 4074.
The guide is located here, and another called a Tweak Guide here; they again carry the risk of removing some things that you might want, like say Internet Connection Firewall... I'm just saying :)