Today’s featured promo on MacUpdate offers Baseline for US$11.99 (40% off, retail $20). “Baseline tells you what files on your Mac are taking up the most hard drive space. Unlike other Disk sizing apps, Baseline can also tell you what has changed since you last scanned your disk, and show you only those items that have changed. You can view your files in a Finder like list or browser view, or graphically, as a TreeMap. You can delete, compress and archive files directly from Baseline, making tidying up your disk a snap.” Baseline requires Mac OS X 10.4 or later.