CCleaner

CCleaner
Version 2.32.1165 (Slim version > No Y! Toolbar option)
Updated May 26, 2010
Added Mar. 18, 2010
Homepage/Developer
File Size : 1 Mb
Compatibility : Windows 2000/XP/Vista/7
Download **
** This is not a direct download link, but will send you to the listing for CCleaner at Majorgeeks, which has list of several download locations to choose from.
For a list of alternative download locations at the developer's site, please visit here.

From the author's description, "CCleaner is a system optimization, privacy and cleaning tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. Additionally it contains a fully featured registry cleaner. But the best part is that it's fast (normally taking less than a second to run) and contains NO Spyware or Adware!

Cleans the following :
Internet Explorer
Temporary files, history, cookies, Autocomplete form history, index.dat.
Firefox
Temporary files, history, cookies, download history, form history.
Google Chrome
Temporary files, history, cookies, download history, form history.
Opera
Temporary files, history, cookies.
Safari
Temporary files, history, cookies, form history.
Windows
Recycle Bin, Recent Documents, Temporary files and Log files.
Registry Cleaner
Advanced features to remove unused and old entries, including File Extensions, ActiveX Controls, ClassIDs, ProgIDs, Uninstallers, Shared DLLs, Fonts, Help Files, Application Paths, Icons, Invalid Shortcuts and more... also comes with a comprehensive backup feature.
Third-party applications
Removes temp files and recent file lists (MRUs) from many apps including Media Player, eMule, Google Toolbar, Netscape, Microsoft Office, Nero, Adobe Acrobat, WinRAR, WinAce, WinZip and many more..