For Garageband. Update to 5.0.2 108MB in size
This update addresses general compatibility issues, improves overall stability, and fixes a number of other minor issues. The issues addressed include:

Improved purchasing experience for Artist Lessons in the GarageBand Lesson Store
Accessing installed Jam Packs in the loop browser
The update is recommended for all users of GarageBand ’09 and required to use the Lesson Store.

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Quicktime update to 7.6.2 60.3MB in size

QuickTime 7.6.2 includes changes that increase reliability, improve compatibility and enhance security. This release is recommended for all QuickTime 7 users.

For detailed information on this update, please visit this website: http://support.apple.com/kb/HT3520.

For information on the security content of this update, please visit this website: http://support.apple.com/kb/HT1222.