Sorry to be tardy to the party. It's nice to hear about all of these cool features. I hope Halo 2 for Vista will feel identical to or very similarly to Halo PC. I personally like how I actually have time to register who hit me with what and from where, whereas if I play Unreal Tournament or any other fast-paced FPS, my inability to think and act quickly and smoothly causes me to die before my finger touches the W key to move. As for Blam Map Cache Files, the reason that they're so damn big is, as Zeph has stated, that a .map file is supposed to contain EVERY RESOURCE for a level. Halo XBox modders should know this. However, Halo 2 and Halo PC maps are a tad different. They use a couple of cache files that are shared for commonly used resources; in Halo PC/CE, you had bitmaps.map, sounds.map, and loc.map. When you add a default texture or sound, tool simply adds something to the map to tell the engine that X image/sound resides at Y offset in sounds/bitmaps.map. Model data, collision BSP data, and tag parameters are still added. Halo 2 Vista will more than likely act in the same way. External downloading is a pain in the ass, yes, but I like it because it doesn't throttle the game server you're playing for bandwidth, and it allows for private beta testing. AFAIK, I can't create a map and give it to just people I know in source modding. Any John Doe can connect to my server, and download my map. Ok, so my ranting at other users is done. I have a question now; I heard that Halo 2 Vista has ditched support for Level of Detail (LOD) models and bitmap mipmapping. Is this true? If that's the case, people without state-of-the-art systems might end up with negative framerates. :X