I got my tablet last night and have spent ages trying to load the kindle app onto it!!

I eventually found a very quick and easy way to do it and will share it with you in the hope that you won't have to spend hours trying like me

You will need: WebOSQuickInstall loaded and working with your device - there are lots of good threads telling you how to do this

1) Download the kindle app from this link MEGAUPLOAD - The leading online storage and file delivery service.
2) Open WebOSQuickInstall (you will need your TP connected and working)
3) Click File ...Add File and add the kindle app you have just downloaded
4) Click Install and wait about 30 seconds
5) You will have the Kindle Beta Icon in your apps
6) You can now enter your UK Amazon details and it works

Good luck