There’s a major controversy about Apple’s software updater pushing Safari 3.1 for Windows with iTunes & Quicktime updates, even if Safari wasn’t installed previously. Adobe did something much sneakier with their CS3 applications. Adobe Bridge CS3 contains a full copy of Opera embedded inside the application.
The current version of CS3 includes Opera 9.2. The latest non-beta Opera version is 9.2. You can even place an alias to the embedded copy of Opera in your applications folder and use it, if you don’t mind running an older version.