The most recent (and hopefully last) of the 0.88 beta series, Adium X 0.88b4 includes Growl 0.7.4b1. Growl users, you'll be prompted to update automatically, no download required as usual. Please see this Growl forum thread and report success or failure if your OS X version / Machine configuration is not yet reported there. Once we know that Growl is good to go, Adium X 0.88 will be ready for release. Thanks! :)