I work for a major media management company (I won't say which one, but it's a number between 18 and 20, and we have American Idol and David Beckham in our stable). For the UK office (where I work as a support technician) we have about 200 users, 90% of which are now on Macs (and every week we're pushing more and more of the workforce towards them)
We're more than happy with the "anaemic" hardware line. MacBooks for 80% of staff, MacBook Pro for managers (and us down in IT) and Mac Pros for the video editors. The hardware is always as good or better than comparatively priced commodity hardware (we usually use Sony Vaios for the few remaining Windows users) but the software.... ...well, let's just say I do very little work. We're desperate to be able to roll out Snow Leopard across the company - Entourage is bloody awful - and the necessary switch to Exchange 07 means we can also officially support iPhones too. It will be a while before we're 100% Mac, and longer still before we can completely shed ourselves of MS software (the majority of which we've fund ot be unstable, insecure and difficult to use) but this Exchange support is a huge leap in the right direction.