Mark Allan has released ClamXav 2.3.2, which fixes an issue that prevented ClamXav Sentry from launching at login when running OS X 10.8 Mountain Lion. The update also fixes an issue where ClamXav Sentry wasn’t able to communicate with the clamd background scanning daemon, plus Engine Uninstaller issues with Gatekeeper. The release’s one addition enables you to open the Sentry log from within ClamXav (and vice versa) by holding down the Option key. (Free, 16.9 MB, release notes)
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.