The minimum you need is Toast 10 and a BR Burner.
Toast will compress your QT movie and author (basic) the BR.
If you want a better compression, you can use Compressor to compress the MPEG-2/MP4 for the BR and import that to Toast for the authoring.
For more elaborated authoring Adobe Encore is the way.
Do a search in this forum. This workflow has been explained many times.
PS: You can use DVDSTP to make non-standard DVDs with HD contents but they play only on Mac.
The share function from FCP is marginal at best and I've not seen a good quality disc come from that yet.
For "Play Only" BluRay discs used at screenings and film festivals we create the MPEG-2 / AC-3 files in Compressor, then author the disc in Adobe Encore and finally burn the disc with Toast or Nero.
For fully authored BluRay discs we use NetBlender DoStudio to author the disc.
The BIG piece of advice - purchase a re-writeable BluRay disc for testing. You can burn and reburn it all you want without having to pay for a new BluRay disc each time. Once that works correctly, then copy it to a regular BluRay disc.
Walter Biscardi, Jr.
Editor, Colorist, Director, Writer, Consultant, Author, Chef. HD Post and Production Biscardi Creative Media
Given they need it tomorrow? Take a quicktime to someone who can make you a disk.
If you have a blu-ray burner (most external ones work fine with OS X, I have Pioneer internal BD in one of my towers) the simplest option is to use Toast Titanium - drag and drop an HD quicktime into Toast and let it do the rest - quick, reliable and far better quality than DVD.
You can also burn a Blu-Ray disk within FCP using the 'share' option - this can be to Blu-Ray or an AVCHD disk, which can be a standard DVD-R with HD data on it. These are less compatible than actual BDs, but a good option for many.
If you wish to take this further, you can use Adobe Encore (which tends to be a nightmare on more complicated BDs on a Mac) or I'm sure certain people here can advise you on more specialist setups. I'd guess, however, that you just want a simple 'enter and play' disk.
I think you'll be suprised how well OS X supports Blu-Ray, despite Mr. Jobs assertions. I have two external and one internal BD burner, and all work seemlessly in OSX.
Edit Out Ltd
FCP Editor/Trainer/System Consultant
EVS/VT Supervisor for live broadcast
RED camera transfer/post