Nice addition for me and all Spanish people with Amazon.es option!! But... I'm not so easy...
My current book collection has titles from around the world, and a feature very nice for me will be the option to search in more than one Amazon site at same time. Like Book Collectorz permits two selections (Amazon.com and Amazon.fr, for example) this will be a nice feature to have in MyStuff2. The possibility to check two or three Amazon sites to perform searches in one operation.
I know this could slow the process, but the feature approaching is (I thing) some like:
1. Look for book in first defined site (for ex. Amazon.com)
2. If found, end the task.
3. If not, look for in the next defined site
4. Repeat until list of defined sites are used
So, two changes to made for this to work. First, multiselecting sites. Second, order them in a priority criteria for searches.