thanks for all the posts. I got my synch back.
I must say that now there are even more steps but for me still worth the extra minute or two this now adds.
-open my book in calibre and convert it to mobi
-open this new mobi file in MobiMetaEditor and add the 113 asin number provided on the amazon site (and ensure that the 501 is EBOK and save the file
-sideload this new file to my kindle by drilling down to the documents folder from my computer
-sideload this same file to the Apps/com.amazon.Lassen/Library/eBooks using iexplorer
-sideload this same file to D:\My Documents\My eBooks\My Kindle Content
-open it on my kindle and go chapter 1 page 2, close book, repopen and close again
-open it on my ipod and it synchs automatically (but the synch button is greyed whatever)
-open the app kindle pc and then open the book and it synch's automatically... or sometimes I click on synch now
this works for me.
kindle3 keyboard ver 3.3
ipod touch (the one with the camera) ios 5.1 and kindle 3.0.1
running pc kindle ver 1.9.1 on windows xp