Following the MacWorld Keynote today, Apple has released several software updates. We assume the majority of the updates have to do with iTunes Movie Rentals and HD Content. Here are the details that are provided by Apple.:

iTunes 7.6 (44.7MB)

Rent and download your favorite movies with iTunes on your computer or directly to your living room on Apple TV. Enjoy rented movies in sizes up to 720p HD with surround sound on your Apple TV and sizes up to DVD-quality on your computer. Transfer your rented movies from iTunes to your iPod or iPhone and enjoy them on the go.

Also, purchase and download your favorite TV shows, music, and more directly on your Apple TV. Effortlessly transfer purchases made on Apple TV back to your computer with iTunes.

QuickTime 7.4 (57.9)

QuickTime 7.4 addresses security issues and delivers:
- Numerous bug fixes
- Support for iTunes

This release is recommended for all QuickTime 7 users.

For detailed information on the security content of this update, please visit this website: http://www.info.apple.com/kbnum/n61798.

iMovie 7.1.1 (16.9)

This update addresses issues when publishing movies to a .Mac Web Gallery, improves overall stability, and addresses a number of other minor issues.

FrontRow 2.1.2 (17.4MB)

This Front Row update provides for bug fixes and improved iTunes compatibility.