You might want to check this article out on converting ebooks and pdfs to be transferred to your Kindle 2 using a program called Savory.
http://www.mydigitallife.info/2009/04/27/convert-and-read-pdf-and-epub-on-amazon-kindle-2-with-savory/
A Kindle 2 user, Jesse Vincent, has developed a software program for Kindle 2, Savory. Savory, which run natively on Kindle, can convert .pdf and .epub files into .mobi format supported by the Kindle 2 ebook reader. Thus, Savory can executes the format conversion on Amazon Kindle device itself. Thus, Kindle 2 owners do not need to manually convert PDFs and ePubs using web-based or desktop tool beforehand, but can straight away download e-books into Kindle 2 though WhisperNet or 3G.
Some limitations of Savory is that Savory only supports Amazon Kindle 2. Amazon Kindle 1 (original or first generation Kindle) is not supported. Beside, the PDF or ePub ebooks have to be DRM-free, and not locked. Savory cannot convert and transcode license or DRM restricted PDF or ePub files to unprotected MobiPocket format.
After installing Savory, Kindle's browser is configured to allow download of PDF (including picture-perfect capability) and ePub documents. Savory runs a small program that watches the 'Documents' directory for any new files with names ending in '.epub' and '.pdf'. When found, Savory will run open-source file conversion program called Calibre to convert the documents to MobiPocket format.
Kindle 2 users can install Savory by download and extract savory-image.zip, and then mount Kindle2 to PC with USB and drag savory-image.ext3 into the "system" folder on Kindle2. Beside installing Savory, user should also apply a Kindle Update, update_Savory-0.06.bin, by copying the file to root directory of the Kindle, and then unmount the kindle and go to "Menu" -> "Settings" -> "Menu" and click "Update Your Kindle".