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Win a Sony Reader by playing 10 Days in Google Books Game. Find out details at Official Google Blog
Official Google Blog: Announcing the 10 Days in Google Books game

Book Hunter is a free application for Mac to catalog, sort, and organize your book collection. To save your time Book Hunter can query online database and easily get all information about your favorite books.

Features of Book Hunter:

iTunes-like interface
Get information quering online database
list to organize your library
self updating smart-list
folder of lists for better organization
link games [...]

Gmail labs has introduced a new security feature by which Authentic emails can be verified easily. It will display a security key at the top of the mail if verified. You can enable this feature by enabling “Authentication icon for verified senders” from the Labs tab under Settings.
It’s a bit of work for senders [...]

Express Invoice is a free invoice software which allows you to create re-occurring invoices for ongoing services and link to credit card gateways to easily process payments for goods and services. Express Invoicing also includes a number of standard reports such as unpaid accounts, payments, sales person, accounting reports and more.

Features of Express Invoice

Create invoices, [...]

Loginox is a free application which lets you easily customize the login screen. You can use Loginox to change the login background image with a single Drag-and-Drop. For switching back to the Leopard default login background image click on the "Reset to default" button.
 

 
Download Loginox – Software to Customize Login Screen on Mac