Smith Micro have launched Spring Cleaning 9 for Mac OS X. The biggest news is that it sports full Universal Binary support for Intel and PowerPC-based Macs. On top of this you get new maintenance and cleaning tabs, a permissions fixer, Spotlight index rebuild button, and the ability to securely delete (zero data) from your hard drive free space. There is also a application uninstaller, plus many more features for your money.
Spring Cleaning 9.0 requires Mac OS X v10.4 and costs $49.99, you can upgrade from a previous version for $19.99.