Apple released iTunes version 9.1.1 today (April 27, 2010). Update when prompted, or open iTunes, click Help - check for updates, then follow the prompts to download and install the update. Uncheck the boxes to update Safari and MobileMe, unless you actually use them. iTunes is hoggish enough without adding more overhead!
CCleaner updated to 2.31.1153 yesterday. CCleaner doesn't include an internal updater, so go here to download the current version. Click on the green "Download Latest Version" button, save it to your Desktop, then double-click the downloaded file to install. DO NOT just click Run when prompted to Run or Save - we've had that conversation. If you'd like a refresher, check previous posts.
Other recent updates include Paint.net: http://www.filehippo.com/download_paint.net/
FastStone Image Viewer: http://www.filehippo.com/download_faststone_image_viewer/
and HiJack This: http://www.filehippo.com/download_hijackthis/