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The Kindle received a Thanksgiving update today, as noted by Dan Benjamin.

Though the software update only pushed one decimal place to version 2.3, the updates include:

• Built-in PDF reader: Your Kindle can now display PDF documents without losing the formatting of the original file. Send PDF documents directly to your Kindle (via your @Kindle address) or drag and drop PDF files from your computer to your Kindle (when connected via USB).
• Manual screen rotation: The Kindle screen can now manually rotate between portrait and landscape views so you can see the entire width of a web page or magnify the page of a PDF file. The page-turn buttons work the same in either orientation, and the 5-way controller movements are switched to match the orientation.
• Option to convert PDF files to Kindle format. If you prefer to have your personal PDF documents converted to the Kindle format (so that they can reflow), type "Convert" in the subject of the e-mail when you submit your personal document to your @kindle.com address.

I've already tried the PDF support. It's not bad… it's probably better on the DX because of the larger screen. As it is, right now, it's a bit small. I'm hesitant to "convert" the PDF I sent as it's a book PDF, and thus, has graphics, side notes, etc. that might mess with the formatting.