Final Cut Studio 5.1, consisting of Final Cut Pro 5, Soundtrack Pro, Motion 2, and DVD Studio Pro 4, is now available as a Universal application, native on both Intel and PowerPC Macs.
New copies of Final Cut Studio 5.1 cost $1,299 USD. Upgrade pricing (from Apple's crossgrade page): $699 upgrade from Final Cut Pro 1, Final Cut Pro 2, or Final Cut Pro 3; $199 upgrade from Final Cut Pro 4 or HD, Motion 2, Soundtrack Pro, DVD Studio Pro 4, or Production Suite; $99 upgrade from Final Cut Pro 5; $49 upgrade from Final Cut Studio.
Apple's pro media applications have been packaged as Final Cut Studio since Final Cut Pro 5 was announced in April last year.
Final Cut Express HD is not yet Universal. According to the online Apple Store, "The next feature release of Final Cut Express will be a Universal application, which will run natively on both PowerPC- and Intel-based Mac computers."