Homebrew actually never supported anything below 10.6, but there is a fork called "Tigerbrew" that 10.4 onwards, intel & PPC. I usually use Macports, but the time I do use Tigerbrew it does seem to work well. It's a shame I cant use my favorite IDE, XCode, but apple seems to use a different format for their new xcode project files. I'd be lucky to get a XCode 4 file to work, let alone something newer.