Qrbelfbrbel. I had to reinstall OS X. I downloaded Xcode and all, but the iPhone SDK won't download again. First try it did, but it opened in Speed Downloader [download manager and accelerator]. It said "404 Forbidden" when the download started. I [think] I made it so that it ASKS me what to do with .dmg [MacBinary, .iso, some other stuff I checked off] and whenever I click the Download SDK 2.1 link, it just loads and loads and never stops.