Since posting this I have tried a few times to get Kindle for Android to sync with Calibre. However, for some reason it isn't detecting the library.
The Samsung Galaxy Tab has a main memory (about 12 gigs free). It shows up as Drive E on my laptop. The removable SD card is Drive F.
If I select "Card A" which is the SD card, it sees a heap of files, mostly spreadsheets and other documents. If I select "Main Memory" of the device, where the Kindle for Android library resides, nothing.
I have submitted a bug report as per the Calibre manual instructions. Hopefully the lads will be able to resolve this one for me.
I've upgraded my library since I last posted this, including updated meta data, book covers and so on, which is reflected on my Kindle DX. I would like to have it replicated on the tablet if possible.