I would like to add that as a Mac user I am not locked into anything. I have more freedom than any Windows user or even Linux user. This goes for just about anything out there: web browsers (more than nine professionally developed browsers available for Mac OS X), music formats (AAC, MP3, VBR, WAV, AIFF CD audio, Apple Lossless, Ogg Vorbis, flac, MPEG4, h.264 and
even bring in WMA files into iTunes), DRM freedoms (when DRM is used, Apple's Fairplay is more liberal than anything else available)... Photoshop plug-ins
.