Google Book Downloader is small utility(developed in .NET) which allows you to save book as PDF from google to your local filesystem and with many features,

• Download any book from Google Books marked as ‘Full view’
• Partially download any book from Google Books marked as ‘Limited preview’
• Access to any book available only for US citizens (instructions)
• Searching for hidden pages (not indexed by Google Books)

The Google Book Downloader application allows users to enter a book’s ISBN number or Google link to pull up the desired book and begin a download, fishing off with exporting the file to a PDF.

P.S.

If you want books, but don’t want to pay for them, there is a better way than walking into your local book store and pocketing them. Try grabbing them online, from Google!

Everyone must be aware of the Google Books Library project by now. If you’re not, it’s basically a way for Google to ensure all of the world’s book content is accessible and searchable. Through the Book Project, Google works with libraries to scan and archive their older and out of print materials.

–from How to download books from Google

references,
* How to use Google Book Downloader?
* How to use geolocation to download a book available only for US citizens?
* Google Book Downloader Homepage
* Google Books Library project

PowerPoint to Silverlight Convertor(PPTX2Silverlight) is an open source application for windows developed in WPF, and it has the following features,
* PPT Convertor with WPF interface
* Presentation Gallery Control (fish-eye) to Show and Launch Converted PPT’s
* Custom Web Server for Hosting Converted PPT’s (No Dependency on IIS)
* Reusable PPT Viewer Component Showing Slides in familiar PowerPoint Look and Feel
* Slide Navigation Controls (backward-forward)
* Full Screen Mode in PPT Viewer
* Built with Silverlight 2.0 RTM
* Available with Installer
for detail, please visit http://pptx2silverlight.codeplex.com/

Here is a piece of requirement of my customer,

Customer:Is there anyway it can carry on looking at the Open folder once it has processed the initial pdfs?
Me:You want batch readerenable monitor the open folder to automatically convert the pdf, right?
Customer:Yes that is right.
…
Customer:Can I confirm that this is for full automation of the reader enabler application. We would like to be able to select the Open folder and also the Save Folder, also once the pdf’s have been processed can they be moved out of the Open folder? So all that we will be left with is a pdf that has been changed on the Save folder?

And now I have developed my new product, Dirmonitor.
Dirmonitor execute an action when a file is modified, for example, execute command line version readerenable when a file created.