Apple has released iTunes 7.1.1, an update that "addresses a stability issue and minor compatibility problems in iTunes 7.1," according to Apple. The update is available via Software Update or as a 28 MB stand-alone download. A 36.1 MB download for Windows is also available.
Single Time Machine Backups
Tired of Time Machine running all the time? You can turn it off in the Time Machine preference pane, but still initiate a single backup by choosing Back Up Now from Time Machine's menu bar icon. Of course, your backup is much less likely to be up to date, but Time Machine won't be taking any resources while you're trying to work.