Not sure what you mean exactly, will13.
The Kindle reads PDF files no problem - it's just that the contrast always seems to be too light compared with normal text, and because you can't dynamically format the text, you have to zoom and pan around, so text can be partially off the viewable screen and so on. I tried a pdf file on the v6000hdt Ainol player too - it looks nice enough but the scrolling is horrible and it's very difficult to instantly find the line you were reading prior to moving the text up.
Aaaannyway (!) - that Calibre program is useful for lots of other things - one can convert a PDF into a text file using it, and if it's mainly text-based it usually works perfectly. Sometimes there are some odd discrepancies that require tidying up - I used Calibre to convert a PDF Health and Safety document into text, for work purposes, and the bulletin points symbol was reproduced as the letter 'i' for whatever reason.
So, regarding the Kindle - yes, it reads PDF, but unless the document is properly optimised for ebook reading in PDF format, be prepared for difficulties in reading it. Convert it to plain text (or MOBI format straight away) using Calibre for a better reading experience.
I know this isn't the proper place to discuss the Kindle in depth, but just in case you are thinking of getting one, I'll make a few brief comments.
First, the battery life is phenomenal - I've read probably 10 decent-sized books on it up to now, with maybe an hour (if that) of the device on charge. And I've got the book cover with integrated light that draws from the Kindle battery, and have used that for maybe 20% of the total reading time. The battery is still around 50% full, and this after maybe 3000 page turns or so, plus trying out the free 3G wifi connection - which is surprisingly good. Otherwise I keep the WiFi turned off.
The contrast is fantastic and the page refresh rate after turning is superb - well under a second per turn - probably faster than 0.5 seconds in fact. The unit is really light too - very easy and comfortable to hold.
The biggest drawbacks that have become apparent up to now - the keyboard can't be disabled or shut down (that I know of) so your capability of holding the thing is diminished quite significantly. It'd be good to have a sliding cover to prevent touching the keys inadvertently, or ideally just a 'lock' facility to disable it. Similarly, for lefties and righties, the page + and - turns are provided on both sides of the device, so holding it on the edge can be somewhat tricky too. There is no touch-screen and the five-way cursor is pretty awful - it's too easy to press the centre 'select' key while trying to navigate in the four directions. And the light with the cover, while really good, doesn't quite reach the bottom-left corner of the screen fully, so reading in really dark conditions is not as nice as it could be
The detractions are really minor compared with its positives, though, and I much prefer e-ink to a normal computer screen for book reading. I just watched Raz demonstrating the ebook capabilities of the MIDnite and he prefers holding real books over all else, so it's definitely a horses-for-courses thing!
Let me know if you have any other Kindle questions and I'll do my best to help/answer. Maybe on another specific thread, seeing as I don't want to detract from the original discussion of this thread.