Note: iBooks app for iPad was announced on January 27, 2010. It can be free downloaded from App Store. The application uses the EPUB format. Sync EPUB eBooks to the iBooks app on iPad with iTunes, which enables you to read EPUB ebook on your iPad.

Here show you two solutions to read PDF on your iPad.

Solution 1: Read PDF as mail attachment on iPad

Have a careful look at the iPad Spec., you will find the item mentioned about PDF supported in as mail attachment. That's to say, iPad support viewing PDF files sent as attachments for iPad mail app. automatically previews the attached PDF. So, what you need is download the PDF attachment and launch, then you can view the PDF documents.

Pro:no need any tool, rapidly read PDF document

Cons: unsupported offline reading PDF, inconvenient to read bundles of PDF files, hard to read back, etc

Solution 2: Convert PDF to EPUB for iPad with Mac PDF to EPUB Converter </strong>

PDF to EPUB Converter for Mac, a fantastic PDF to EPUB converting program, specially designed for Mac users, converts PDF to EPUB eBooks for iPad on Mac. Meanwhile, it is very easy to handle. Barely two or three steps can finish all the job.

The simple guide shows on the image below:

After the conversion, you can easily transfer or sync the .epub document to iPad.

1. Connect iPad to Mac and open iTunes

2. Drag and drop ePub ebooks to the iTunes Books Library

3. Sync eBooks to your iPad via iTunes, then the epub file(s) will be automatically in your iBooks app.

Resource: http://pdf-to-epub.com/tutorials/pdf-to-ipad-mac.html